1991 Peterbilt 378 Engine Cooling Parts
Keep Your 1991 Peterbilt 378 in Top Shape with Quality Engine Cooling Parts
Whether you’re repairing or upgrading your Engine Cooling Part, using high-quality parts is key to keeping your 1991 Peterbilt 378 looking sharp and performing at its best. At Advance Auto Parts we carry a wide selection of dependable options, including Water Pumps, Coolant Temperature Sensors, and Thermostats. Whether you’re replacing a damaged part or enhancing your truck’s style and protection, you’ll find exactly what you need to get the job done right.
Competitive Prices and Extensive Inventory
The average price for a 1991 Peterbilt 378 Engine Cooling Part at Advance Auto Parts is around $97.05, with a range that starts at $4.99 and goes up to $618.99. With 23 options in stock from 2 trusted brands, finding the right fit is easy. Popular picks like Thermostat: With Seal, 190 Degrees, Coolant Spin-On Filter with BTA PLUS Formula, and Heavy Duty Thermostat: With Seal, 190 Degrees start at just $29.99 and offer a great balance of form and function.
Explore Related Parts
While you’re upgrading or replacing your Engine Cooling Part, don’t forget to check out other key components like Air Conditioning Parts and Blower Motor and Related Products. At Advance Auto Parts, we’re here to help you keep your 1991 Peterbilt 378 in peak condition, inside and out.
Find Your Specific 1991 Peterbilt 378 Engine Cooling Parts
Looking for the perfect Engine Cooling Part for your 1991 Peterbilt 378? You’re in the right place. Below, you’ll find links to various types of Engine Cooling Parts that fit your vehicle. At Advance Auto Parts, we offer only the highest quality OEM and aftermarket Engine Cooling Parts, ensuring durability and a precise fit for your Peterbilt 378. Whether you’re driving a 1991 model or another popular model year like
1999,
2000,
2001,
2002,
2003,
2004,
2005,
2006, and
2007, we’ve got you covered. Purchasing Engine Cooling Parts from Advance Auto Parts is a smart choice, giving you access to trusted brands and parts built to perform. Below, you’ll find links to various types of Engine Cooling Parts that fit your vehicle.
Essential 1991 Peterbilt 378 Engine Cooling Parts
Gates – Heavy-Duty Engine Water Pump (Part No.46002HD)
from
$568.99
Gates carries a huge line of water pumps for heavy duty applications. Our heavy duty water pump offering is designed to handle rugged Fleet standards.
Product Features:
See More
Product Features:
- Our heavy-duty water pump is designed to withstand severe and rigorous conditions.
- Bearings and seals tested 100% separately.
- Computerized machined surfaces for proper fit and sealing
- Gates heavy-duty water pumps are represented as a part number with an HD suffix
- Backed by a limited warranty
- New pumps manufactured according to ISO/TS 16949 standards
Gates – Heavy-Duty Engine Water Pump (Part No.43307HD)
from
$450.99
Gates carries a huge line of water pumps for heavy duty applications. Our heavy duty water pump offering is designed to handle rugged Fleet standards.
Product Features:
See More
Product Features:
- Our heavy-duty water pump O-ring is designed to handle severe and rigorous conditions
- Fully tested unified bearings and seals
- Computer-machined surfaces for a proper fit and seal
- Gates heavy-duty water pumps are represented as a part number with an HD suffix
- Backed by a limited warranty
- New pumps manufactured according to ISO/TS 16949 standards
Carquest Premium – Engine Water Pump_New (Part No.T2212)
from
$54.99
This premium water pump uses new high-quality components and is designed to meet or exceed OE specifications. This pump is 100% tested to ensure quality. Bearings, gaskets, seals, impeller, hub and housing are all designed for long-lasting service life. All necessary gaskets and seals are included.
Product Features:
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Product Features:
- This pump is used on accessory belt driven applications
- Equipped with weep chamber or similar feature to help prevent unnecessary replacement
- Cast (grey) iron housing
- All gaskets or seals necessary for installation are supplied with pump
- Durable housing features precisely machined mounting surfaces for proper sealing
- Additional Notes: Includes gasket
Gates – Heavy-Duty Engine Water Pump (Part No.44052HD)
from
$481.99
Gates carries a huge line of water pumps for heavy duty applications. Our heavy duty water pump offering is designed to handle rugged Fleet standards.
Product Features:
See More
Product Features:
- Our heavy-duty water pump is designed to withstand severe and rigorous conditions.
- Fully tested unified bearings and seals
- Computerized machined surfaces for proper fit and sealing
- Gates heavy-duty water pumps are represented by a part number with an HD suffix.
- Backed by a limited warranty
- New pumps manufactured according to ISO/TS 16949 standards
Carquest Premium – Engine Water Pump: New (Part No.T5099)
from
$361.99
This premium water pump uses new high-quality components and is designed to meet or exceed OE specifications. This pump is 100% tested to ensure quality. Bearings, gaskets, seals, impeller, hub and housing are all designed for long-lasting service life. All necessary gaskets and seals are included.
Product Features:
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Product Features:
- 100% tested for reliable performance
- Durable housing features precisely machined mounting surface for proper sealing and fitment
- Equipped with weep chamber or similar feature to help prevent unnecessary replacement
- Included heavy-duty unitized bearings, pressed-on hubs and optimal impeller clearance for a long-lasting water pump
- All gaskets or seals necessary for water pump are included
- This pump is driven by the accessory belt and we recommend replacement if nearing service recommendation
- This pump is driven by the timing chain; see vehicle manufacturer recommendation for replacement of timing components
- This pump is driven by the timing belt; see vehicle manufacturer recommendation for replacement of timing components
- Additional Notes: Includes gasket
Gates – Heavy-Duty Engine Water Pump (Part No.44054HD)
from
$703.99
Gates carries a huge line of water pumps for heavy duty applications. Our heavy duty water pump offering is designed to handle rugged Fleet standards.
Product Features:
See More
Product Features:
- Our heavy-duty water pump is designed to withstand severe and rigorous conditions.
- Fully tested unified bearings and seals
- Computer-machined surfaces for perfect installation and sealing
- Gates heavy-duty water pumps are represented as a part number with an HD suffix
- Backed by a limited warranty
- New pumps manufactured according to ISO/TS 16949 standards
Gates – Heavy-Duty Engine Water Pump (Part No.44092HD)
from
$212.99
Gates carries a huge line of water pumps for heavy duty applications. Our heavy duty water pump offering is designed to handle rugged Fleet standards.
Product Features:
See More
Product Features:
- Our heavy-duty water pump O-ring is designed to handle severe and rigorous conditions
- 100 percent fully tested unitized bearings and seals
- Computer-machined surfaces for perfect installation and sealing
- Gates heavy-duty water pumps are represented by a part number with an HD suffix.
- Backed by a limited warranty
- New pumps manufactured according to ISO/TS 16949 standards
Carquest Premium – Coolant Temperature Sensor (Part No.WTA2365)
from
$4.99
Approved materials for increased durability in even the most extreme temperatures. All Carquest Coolant Temperature Sensors are designed to meet or exceed OEM specifications at our ISO TS16949 manufacturing facilities.
Product Features:
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Product Features:
- 100% factory resistance calibrated to ensure precision tolerances, resulting in extremely accurate temperature for optimal performance
- Thread Sealant and/or O-ring pre-installed on applicable sensors to ensure leak free performance
- Brass sensor housing precision machined to meet or exceed OE thermal conductivity
- OE precision matched thermistor position for correct output parameters
- Extensive product testing includes salt spray, high/low temperature impact, thermal vibration, durability, static electricity, and micro tension, among other tests, to ensure all sensors meet or exceed OEM specifications.
- Extensive design validation testing and 100% end-of-line tested
- Carquest Vehicle Solutions Technical Support available from ASE certified technicians: 1-866-687-5413
Carquest Premium – Coolant Temperature Sensor (Part No.WTA2372)
from
$4.99
Approved materials for increased durability in even the most extreme temperatures. All Carquest Coolant Temperature Sensors are designed to meet or exceed OEM specifications at our ISO TS16949 manufacturing facilities.
Product Features:
See More
Product Features:
- 100% factory resistance calibrated to ensure precision tolerances, resulting in extremely accurate temperature for optimal performance
- Thread Sealant and/or O-ring pre-installed on applicable sensors to ensure leak free performance
- Brass sensor housing precision machined to meet or exceed OE thermal conductivity
- OE precision matched thermistor position for correct output parameters
- Extensive product testing includes salt spray, high/low temperature impact, thermal vibration, durability, static electricity, and micro tension, among other tests, to ensure all sensors meet or exceed OEM specifications.
- Extensive design validation testing and 100% end-of-line tested
- Carquest Vehicle Solutions Technical Support available from ASE certified technicians: 1-866-687-5413
Carquest Premium – Coolant Temperature Sensor 1TS1035 (Part No.WTC1082)
from
$54.99
Product Features:
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- Designed to meet or exceed OE specifications for fit, form and function
- 100% factory resistance calibrated to ensure precision tolerances, resulting in extremely accurate temperature for optimal performance
- OE precision matched thermistor ensuring Carquest sensors match OE output resistances across all temperature positions
- O-rings, seals or thread sealant are included if required
- Weather-tight connectors prevent leaks and corrosion for longer life
- Extensive design validation testing and 100% end-of-line tested
- Carquest Vehicle Solutions Technical Support available from ASE certified technicians: 1-866-687-5413
Carquest Premium – Coolant Temperature Sensor (Part No.WTA2369)
from
$4.99
Approved materials for increased durability in even the most extreme temperatures. All Carquest Coolant Temperature Sensors are designed to meet or exceed OEM specifications at our ISO TS16949 manufacturing facilities.
Product Features:
See More
Product Features:
- 100% factory resistance calibrated to ensure precision tolerances, resulting in extremely accurate temperature for optimal performance
- Thread Sealant and/or O-ring pre-installed on applicable sensors to ensure leak free performance
- Brass sensor housing precision machined to meet or exceed OE thermal conductivity
- OE precision matched thermistor position for correct output parameters
- Extensive product testing includes salt spray, high/low temperature impact, thermal vibration, durability, static electricity, and micro tension, among other tests, to ensure all sensors meet or exceed OEM specifications.
- Extensive design validation testing and 100% end-of-line tested
- Carquest Vehicle Solutions Technical Support available from ASE certified technicians: 1-866-687-5413
Carquest Premium – Coolant Spin-On Filter with BTA PLUS Formula (Part No.89112)
from
$134.99
Carquest Premium Coolant Filters protect your engine’s cooling system by filtering out rust, scale, dirt, and other particles from the coolant fluid. Coolant filters remove contaminants that build up and cause clogging or corrosion in the radiator, water pump, heater core, and engine passages. By keeping the coolant clean and effective, these filters help prevent overheating and ensure optimal engine performance. Carquest Premium Coolant Filters are designed to meet or exceed the performance requirements of the Original Equipment Manufacturer (OEM).
Product Features:
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Product Features:
- Original Equipment Manufacturer (OEM) Design: Designed to meet or exceed OEM performance standards.
- Effective Contaminant Removal:┐Filters out rust, scale, dirt and particulates from coolant fluid.
- Protects Cooling System Components:┐Prevents clogging and corrosion in radiators, water pumps, heater cores, and engine passages.
- Enhances Engine Performance:┐Maintains efficient temperature regulation, preventing overheating.
Carquest Premium – Coolant Spin-On Filter with BTA PLUS Formula (Part No.89075)
from
$59.99
Carquest Premium Coolant Filters protect your engine’s cooling system by filtering out rust, scale, dirt, and other particles from the coolant fluid. Coolant filters remove contaminants that build up and cause clogging or corrosion in the radiator, water pump, heater core, and engine passages. By keeping the coolant clean and effective, these filters help prevent overheating and ensure optimal engine performance. Carquest Premium Coolant Filters are designed to meet or exceed the performance requirements of the Original Equipment Manufacturer (OEM).
Product Features:
See More
Product Features:
- Original Equipment Manufacturer (OEM) Design: Designed to meet or exceed OEM performance standards.
- Effective Contaminant Removal:┐Filters out rust, scale, dirt and particulates from coolant fluid.
- Protects Cooling System Components:┐Prevents clogging and corrosion in radiators, water pumps, heater cores, and engine passages.
- Enhances Engine Performance:┐Maintains efficient temperature regulation, preventing overheating.
Carquest Premium – Coolant Spin-On Filter with BTA PLUS Formula (Part No.99065)
from
$71.99
Carquest Premium Coolant Filters protect your engine’s cooling system by filtering out rust, scale, dirt, and other particles from the coolant fluid. Coolant filters remove contaminants that build up and cause clogging or corrosion in the radiator, water pump, heater core, and engine passages. By keeping the coolant clean and effective, these filters help prevent overheating and ensure optimal engine performance. Carquest Premium Coolant Filters are designed to meet or exceed the performance requirements of the Original Equipment Manufacturer (OEM).
Product Features:
See More
Product Features:
- Original Equipment Manufacturer (OEM) Design: Designed to meet or exceed OEM performance standards.
- Effective Contaminant Removal:┐Filters out rust, scale, dirt and particulates from coolant fluid.
- Protects Cooling System Components:┐Prevents clogging and corrosion in radiators, water pumps, heater cores, and engine passages.
- Enhances Engine Performance:┐Maintains efficient temperature regulation, preventing overheating.
Carquest Premium – Coolant Spin-On Filter without Chemicals (Part No.89113)
from
$85.99
Carquest Premium Coolant Filters protect your engine’s cooling system by filtering out rust, scale, dirt, and other particles from the coolant fluid. Coolant filters remove contaminants that build up and cause clogging or corrosion in the radiator, water pump, heater core, and engine passages. By keeping the coolant clean and effective, these filters help prevent overheating and ensure optimal engine performance. Carquest Premium Coolant Filters are designed to meet or exceed the performance requirements of the Original Equipment Manufacturer (OEM).
Product Features:
See More
Product Features:
- Original Equipment Manufacturer (OEM) Design: Designed to meet or exceed OEM performance standards.
- Effective Contaminant Removal:┐Filters out rust, scale, dirt and particulates from coolant fluid.
- Protects Cooling System Components:┐Prevents clogging and corrosion in radiators, water pumps, heater cores, and engine passages.
- Enhances Engine Performance:┐Maintains efficient temperature regulation, preventing overheating.
Carquest Premium – Coolant Spin-On Filter with BTA PLUS Formula (Part No.96324)
from
$29.99
Carquest Premium Coolant Filters protect your engine’s cooling system by filtering out rust, scale, dirt, and other particles from the coolant fluid. Coolant filters remove contaminants that build up and cause clogging or corrosion in the radiator, water pump, heater core, and engine passages. By keeping the coolant clean and effective, these filters help prevent overheating and ensure optimal engine performance. Carquest Premium Coolant Filters are designed to meet or exceed the performance requirements of the Original Equipment Manufacturer (OEM).
Product Features:
See More
Product Features:
- Original Equipment Manufacturer (OEM) Design: Designed to meet or exceed OEM performance standards.
- Effective Contaminant Removal:┐Filters out rust, scale, dirt and particulates from coolant fluid.
- Protects Cooling System Components:┐Prevents clogging and corrosion in radiators, water pumps, heater cores, and engine passages.
- Enhances Engine Performance:┐Maintains efficient temperature regulation, preventing overheating.
Carquest Premium – Coolant Spin-On Filter with BTA PLUS Formula (Part No.89197)
from
$60.99
Carquest Premium Coolant Filters protect your engine’s cooling system by filtering out rust, scale, dirt, and other particles from the coolant fluid. Coolant filters remove contaminants that build up and cause clogging or corrosion in the radiator, water pump, heater core, and engine passages. By keeping the coolant clean and effective, these filters help prevent overheating and ensure optimal engine performance. Carquest Premium Coolant Filters are designed to meet or exceed the performance requirements of the Original Equipment Manufacturer (OEM).
Product Features:
See More
Product Features:
- Original Equipment Manufacturer (OEM) Design: Designed to meet or exceed OEM performance standards.
- Effective Contaminant Removal:┐Filters out rust, scale, dirt and particulates from coolant fluid.
- Protects Cooling System Components:┐Prevents clogging and corrosion in radiators, water pumps, heater cores, and engine passages.
- Enhances Engine Performance:┐Maintains efficient temperature regulation, preventing overheating.
Carquest Premium – Engine Coolant HD Thermostat: With Seal, 190 Degrees (Part No.15009)
from
$87.99
Carquest Premium Thermostats are manufactured with OEM quality materials and safety standards by an OE Supplier. This thermostat will meet and exceed the expectations of the OE thermostat to insure the best product for your cooling system. Stands up to even the most demanding automotive cooling systems. Manufactured with OEM specifications and processes. Copper case and wax compound assures rapid response to temperature changes in the coolant. Offset design, air relief valve, and OEM style seals included where applicable.
Product Features:
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Product Features:
- High grade stainless steel and copper construction
- Meets or exceeds OEM standards
- Consistent and precise response to cooling system needs
- Original equipment design for worry-free direct fit replacement
- 100% tested and calibrated
Carquest Premium – Thermostat: With Seal, 170 Degrees (Part No.14537)
from
$52.99
Carquest Premium Thermostats are manufactured with OEM quality materials and safety standards by an OE Supplier. This thermostat will meet and exceed the expectations of the OE thermostat to insure the best product for your cooling system. Stands up to even the most demanding automotive cooling systems. Manufactured with OEM specifications and processes. Copper case and wax compound assures rapid response to temperature changes in the coolant. Offset design, air relief valve, and OEM style seals included where applicable.
Product Features:
See More
Product Features:
- High grade stainless steel and copper construction
- Meets or exceeds OEM standards
- Consistent and precise response to cooling system needs
- Original equipment design for worry-free direct fit replacement
- 100% tested and calibrated
Carquest Premium – Engine Coolant HD Thermostat: With Seal, 190 Degrees (Part No.15199)
from
$68.99
Carquest Premium Thermostats are manufactured with OEM quality materials and safety standards by an OE Supplier. This thermostat will meet and exceed the expectations of the OE thermostat to insure the best product for your cooling system. Stands up to even the most demanding automotive cooling systems. Manufactured with OEM specifications and processes. Copper case and wax compound assures rapid response to temperature changes in the coolant. Offset design, air relief valve, and OEM style seals included where applicable.
Product Features:
See More
Product Features:
- High grade stainless steel and copper construction
- Meets or exceeds OEM standards
- Consistent and precise response to cooling system needs
- Original equipment design for worry-free direct fit replacement
- 100% tested and calibrated
Carquest Premium – Integrated Housing HD Thermostat: 180 Degrees (Part No.14908)
from
$89.99
Carquest Premium Thermostats are manufactured with OEM quality materials and safety standards by an OE Supplier. This thermostat will meet and exceed the expectations of the OE thermostat to insure the best product for your cooling system. Stands up to even the most demanding automotive cooling systems. Manufactured with OEM specifications and processes. Copper case and wax compound assures rapid response to temperature changes in the coolant. Offset design, air relief valve, and OEM style seals included where applicable.
Product Features:
See More
Product Features:
- High grade stainless steel and copper construction
- Meets or exceeds OEM standards
- Consistent and precise response to cooling system needs
- Original equipment design for worry-free direct fit replacement
- 100% tested and calibrated
Carquest Premium – Thermostat: With Seal, 190 Degrees (Part No.14539)
from
$39.99
Carquest Premium Thermostats are manufactured with OEM quality materials and safety standards by an OE Supplier. This thermostat will meet and exceed the expectations of the OE thermostat to insure the best product for your cooling system. Stands up to even the most demanding automotive cooling systems. Manufactured with OEM specifications and processes. Copper case and wax compound assures rapid response to temperature changes in the coolant. Offset design, air relief valve, and OEM style seals included where applicable.
Product Features:
See More
Product Features:
- Consistent and precise response to cooling system needs
- Original equipment design for worry-free direct fit replacement
- 100% tested and calibrated
- High grade stainless steel and copper construction
- Meets or exceeds OEM standards
Carquest Premium – Heavy Duty Thermostat: With Seal, 180 Degrees (Part No.15008)
from
$96.99
Carquest Premium Thermostats are manufactured with OEM quality materials and safety standards by an OE Supplier. This thermostat will meet and exceed the expectations of the OE thermostat to insure the best product for your cooling system. Stands up to even the most demanding automotive cooling systems. Manufactured with OEM specifications and processes. Copper case and wax compound assures rapid response to temperature changes in the coolant. Offset design, air relief valve, and OEM style seals included where applicable.
Product Features:
See More
Product Features:
- High grade stainless steel and copper construction
- Meets or exceeds OEM standards
- Consistent and precise response to cooling system needs
- Original equipment design for worry-free direct fit replacement
- 100% tested and calibrated
Carquest Premium – Heavy Duty Thermostat: With Seal, 180 Degrees (Part No.15198)
from
$55.99
Carquest Premium Thermostats are manufactured with OEM quality materials and safety standards by an OE Supplier. This thermostat will meet and exceed the expectations of the OE thermostat to insure the best product for your cooling system. Stands up to even the most demanding automotive cooling systems. Manufactured with OEM specifications and processes. Copper case and wax compound assures rapid response to temperature changes in the coolant. Offset design, air relief valve, and OEM style seals included where applicable.
Product Features:
See More
Product Features:
- High grade stainless steel and copper construction
- Meets or exceeds OEM standards
- Consistent and precise response to cooling system needs
- Original equipment design for worry-free direct fit replacement
- 100% tested and calibrated
Carquest Premium – Standard Thermostat: With Seal, 190 Degrees (Part No.14289)
from
$36.99
Carquest Premium Thermostats are manufactured with OEM quality materials and safety standards by an OE Supplier. This thermostat will meet and exceed the expectations of the OE thermostat to insure the best product for your cooling system. Stands up to even the most demanding automotive cooling systems. Manufactured with OEM specifications and processes. Copper case and wax compound assures rapid response to temperature changes in the coolant. Offset design, air relief valve, and OEM style seals included where applicable.
Product Features:
See More
Product Features:
- High grade stainless steel and copper construction
- Meets or exceeds OEM standards
- Consistent and precise response to cooling system needs
- Original equipment design for worry-free direct fit replacement
- 100% tested and calibrated
Carquest Premium – Heavy Duty Thermostat: 175 Degrees (Part No.14917)
from
$62.99
Carquest Premium Thermostats are manufactured with OEM quality materials and safety standards by an OE Supplier. This thermostat will meet and exceed the expectations of the OE thermostat to insure the best product for your cooling system. Stands up to even the most demanding automotive cooling systems. Manufactured with OEM specifications and processes. Copper case and wax compound assures rapid response to temperature changes in the coolant. Offset design, air relief valve, and OEM style seals included where applicable.
Product Features:
See More
Product Features:
- High grade stainless steel and copper construction
- Meets or exceeds OEM standards
- Consistent and precise response to cooling system needs
- Original equipment design for worry-free direct fit replacement
- 100% tested and calibrated
Carquest Premium – Heavy Duty Thermostat: 175 Degrees (Part No.14857)
from
$64.99
Carquest Premium Thermostats are manufactured with OEM quality materials and safety standards by an OE Supplier. This thermostat will meet and exceed the expectations of the OE thermostat to insure the best product for your cooling system. Stands up to even the most demanding automotive cooling systems. Manufactured with OEM specifications and processes. Copper case and wax compound assures rapid response to temperature changes in the coolant. Offset design, air relief valve, and OEM style seals included where applicable.
Product Features:
See More
Product Features:
- High grade stainless steel and copper construction
- Meets or exceeds OEM standards
- Consistent and precise response to cooling system needs
- Original equipment design for worry-free direct fit replacement
- 100% tested and calibrated
Carquest Premium – Engine Coolant HD Thermostat: With Seal, 160 Degrees (Part No.15006)
from
$86.99
Carquest Premium Thermostats are manufactured with OEM quality materials and safety standards by an OE Supplier. This thermostat will meet and exceed the expectations of the OE thermostat to insure the best product for your cooling system. Stands up to even the most demanding automotive cooling systems. Manufactured with OEM specifications and processes. Copper case and wax compound assures rapid response to temperature changes in the coolant. Offset design, air relief valve, and OEM style seals included where applicable.
Product Features:
See More
Product Features:
- High grade stainless steel and copper construction
- Meets or exceeds OEM standards
- Consistent and precise response to cooling system needs
- Original equipment design for worry-free direct fit replacement
- 100% tested and calibrated
Popular 1991 Peterbilt 378 Engine Cooling Parts Categories
Most Popular Water Pumps for 1991 Peterbilt 378s
Enhance your 1991 Peterbilt 378 with one of the 6 Water Pumps we have in stock, starting at just $258.99.
Gates – Heavy-Duty Engine Water Pump (Part No.44066HD)
from
$434.99
Gates carries a huge line of water pumps for heavy duty applications. Our heavy duty water pump offering is designed to handle rugged Fleet standards.
Product Features:
See More
Product Features:
- Our heavy-duty water pump O-ring is designed to handle severe and rigorous conditions
- Bearings and seals tested 100% separately.
- Computerized machined surfaces for proper fit and sealing
- Gates heavy-duty water pumps are represented as a part number with an HD suffix
- Backed by a limited warranty
- New pumps manufactured according to ISO/TS 16949 standards
Gates – Heavy-Duty Engine Water Pump (Part No.45009HD)
from
$618.99
Gates carries a huge line of water pumps for heavy duty applications. Our heavy duty water pump offering is designed to handle rugged Fleet standards.
Product Features:
See More
Product Features:
- Our heavy-duty water pump O-ring is designed to handle severe and rigorous conditions
- Bearings and seals tested 100% separately.
- Computer-machined surfaces for a proper fit and seal
- Gates heavy-duty water pumps are represented as a part number with an HD suffix
- Backed by a limited warranty
- New pumps manufactured to ISO/TS 16949 standards
Gates – Heavy-Duty Engine Water Pump (Part No.46002HD)
from
$568.99
Gates carries a huge line of water pumps for heavy duty applications. Our heavy duty water pump offering is designed to handle rugged Fleet standards.
Product Features:
See More
Product Features:
- Our heavy-duty water pump is designed to withstand severe and rigorous conditions.
- Bearings and seals tested 100% separately.
- Computerized machined surfaces for proper fit and sealing
- Gates heavy-duty water pumps are represented as a part number with an HD suffix
- Backed by a limited warranty
- New pumps manufactured according to ISO/TS 16949 standards
Gates – Heavy-Duty Engine Water Pump (Part No.44052HD)
from
$481.99
Gates carries a huge line of water pumps for heavy duty applications. Our heavy duty water pump offering is designed to handle rugged Fleet standards.
Product Features:
See More
Product Features:
- Our heavy-duty water pump is designed to withstand severe and rigorous conditions.
- Fully tested unified bearings and seals
- Computerized machined surfaces for proper fit and sealing
- Gates heavy-duty water pumps are represented by a part number with an HD suffix.
- Backed by a limited warranty
- New pumps manufactured according to ISO/TS 16949 standards
Gates – Heavy-Duty Engine Water Pump (Part No.43307HD)
from
$450.99
Gates carries a huge line of water pumps for heavy duty applications. Our heavy duty water pump offering is designed to handle rugged Fleet standards.
Product Features:
See More
Product Features:
- Our heavy-duty water pump O-ring is designed to handle severe and rigorous conditions
- Fully tested unified bearings and seals
- Computer-machined surfaces for a proper fit and seal
- Gates heavy-duty water pumps are represented as a part number with an HD suffix
- Backed by a limited warranty
- New pumps manufactured according to ISO/TS 16949 standards
Gates – Heavy-Duty Engine Water Pump (Part No.41175HD)
from
$258.99
Gates carries a huge line of water pumps for heavy duty applications. Our heavy duty water pump offering is designed to handle rugged Fleet standards.
Product Features:
See More
Product Features:
- Our heavy-duty water pump is designed to withstand severe and rigorous conditions.
- Bearings and seals tested 100% separately.
- Computer-machined surfaces for a proper fit and seal
- Gates heavy-duty water pumps are represented as a part number with an HD suffix
- Backed by a limited warranty
- New pumps manufactured according to ISO/TS 16949 standards
Best-Selling 1991 Peterbilt 378 Coolant Temperature Sensors
Upgrade your 378 with one of our 2 best-selling Coolant Temperature Sensors.
Carquest Premium – Coolant Temperature Sensor (Part No.WTA2372)
from
$4.99
Approved materials for increased durability in even the most extreme temperatures. All Carquest Coolant Temperature Sensors are designed to meet or exceed OEM specifications at our ISO TS16949 manufacturing facilities.
Product Features:
See More
Product Features:
- 100% factory resistance calibrated to ensure precision tolerances, resulting in extremely accurate temperature for optimal performance
- Thread Sealant and/or O-ring pre-installed on applicable sensors to ensure leak free performance
- Brass sensor housing precision machined to meet or exceed OE thermal conductivity
- OE precision matched thermistor position for correct output parameters
- Extensive product testing includes salt spray, high/low temperature impact, thermal vibration, durability, static electricity, and micro tension, among other tests, to ensure all sensors meet or exceed OEM specifications.
- Extensive design validation testing and 100% end-of-line tested
- Carquest Vehicle Solutions Technical Support available from ASE certified technicians: 1-866-687-5413
Carquest Premium – Coolant Temperature Sensor (Part No.WTA2369)
from
$4.99
Approved materials for increased durability in even the most extreme temperatures. All Carquest Coolant Temperature Sensors are designed to meet or exceed OEM specifications at our ISO TS16949 manufacturing facilities.
Product Features:
See More
Product Features:
- 100% factory resistance calibrated to ensure precision tolerances, resulting in extremely accurate temperature for optimal performance
- Thread Sealant and/or O-ring pre-installed on applicable sensors to ensure leak free performance
- Brass sensor housing precision machined to meet or exceed OE thermal conductivity
- OE precision matched thermistor position for correct output parameters
- Extensive product testing includes salt spray, high/low temperature impact, thermal vibration, durability, static electricity, and micro tension, among other tests, to ensure all sensors meet or exceed OEM specifications.
- Extensive design validation testing and 100% end-of-line tested
- Carquest Vehicle Solutions Technical Support available from ASE certified technicians: 1-866-687-5413
Top-Quality Thermostats for 1991 Peterbilt 378s
Choose a high-quality OEM or aftermarket Thermostat for Peterbilt 378s and enjoy top-notch performance from $36.99.
Carquest Premium – Thermostat: With Seal, 190 Degrees (Part No.14539)
from
$39.99
Carquest Premium Thermostats are manufactured with OEM quality materials and safety standards by an OE Supplier. This thermostat will meet and exceed the expectations of the OE thermostat to insure the best product for your cooling system. Stands up to even the most demanding automotive cooling systems. Manufactured with OEM specifications and processes. Copper case and wax compound assures rapid response to temperature changes in the coolant. Offset design, air relief valve, and OEM style seals included where applicable.
Product Features:
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Product Features:
- Consistent and precise response to cooling system needs
- Original equipment design for worry-free direct fit replacement
- 100% tested and calibrated
- High grade stainless steel and copper construction
- Meets or exceeds OEM standards
Carquest Premium – Heavy Duty Thermostat: With Seal, 190 Degrees (Part No.15229)
from
$51.99
Carquest Premium Thermostats are manufactured with OEM quality materials and safety standards by an OE Supplier. This thermostat will meet and exceed the expectations of the OE thermostat to insure the best product for your cooling system. Stands up to even the most demanding automotive cooling systems. Manufactured with OEM specifications and processes. Copper case and wax compound assures rapid response to temperature changes in the coolant. Offset design, air relief valve, and OEM style seals included where applicable.
Product Features:
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Product Features:
- Consistent and precise response to cooling system needs
- Original equipment design for worry-free direct fit replacement
- 100% tested and calibrated
- High grade stainless steel and copper construction
- Meets or exceeds OEM standards
Carquest Premium – Heavy Duty Thermostat: With Seal, 180 Degrees (Part No.15228)
from
$50.99
Carquest Premium Thermostats are manufactured with OEM quality materials and safety standards by an OE Supplier. This thermostat will meet and exceed the expectations of the OE thermostat to insure the best product for your cooling system. Stands up to even the most demanding automotive cooling systems. Manufactured with OEM specifications and processes. Copper case and wax compound assures rapid response to temperature changes in the coolant. Offset design, air relief valve, and OEM style seals included where applicable.
Product Features:
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Product Features:
- High grade stainless steel and copper construction
- Meets or exceeds OEM standards
- Consistent and precise response to cooling system needs
- Original equipment design for worry-free direct fit replacement
- 100% tested and calibrated
Carquest Premium – Thermostat: With Seal, 190 Degrees (Part No.14239)
from
$41.99
Carquest Premium Thermostats are manufactured with OEM quality materials and safety standards by an OE Supplier. This thermostat will meet and exceed the expectations of the OE thermostat to insure the best product for your cooling system. Stands up to even the most demanding automotive cooling systems. Manufactured with OEM specifications and processes. Copper case and wax compound assures rapid response to temperature changes in the coolant. Offset design, air relief valve, and OEM style seals included where applicable.
Product Features:
See More
Product Features:
- Consistent and precise response to cooling system needs
- Original equipment design for worry-free direct fit replacement
- 100% tested and calibrated
- High grade stainless steel and copper construction
- Meets or exceeds OEM standards
Carquest Premium – Thermostat: With Seal, 160 Degrees (Part No.14536)
from
$36.99
Carquest Premium Thermostats are manufactured with OEM quality materials and safety standards by an OE Supplier. This thermostat will meet and exceed the expectations of the OE thermostat to insure the best product for your cooling system. Stands up to even the most demanding automotive cooling systems. Manufactured with OEM specifications and processes. Copper case and wax compound assures rapid response to temperature changes in the coolant. Offset design, air relief valve, and OEM style seals included where applicable.
Product Features:
See More
Product Features:
- High grade stainless steel and copper construction
- Meets or exceeds OEM standards
- Consistent and precise response to cooling system needs
- Original equipment design for worry-free direct fit replacement
- 100% tested and calibrated
Carquest Premium – Thermostat: With Seal, 170 Degrees (Part No.14537)
from
$52.99
Carquest Premium Thermostats are manufactured with OEM quality materials and safety standards by an OE Supplier. This thermostat will meet and exceed the expectations of the OE thermostat to insure the best product for your cooling system. Stands up to even the most demanding automotive cooling systems. Manufactured with OEM specifications and processes. Copper case and wax compound assures rapid response to temperature changes in the coolant. Offset design, air relief valve, and OEM style seals included where applicable.
Product Features:
See More
Product Features:
- High grade stainless steel and copper construction
- Meets or exceeds OEM standards
- Consistent and precise response to cooling system needs
- Original equipment design for worry-free direct fit replacement
- 100% tested and calibrated
Carquest Premium – Thermostat: With Seal, 180 Degrees (Part No.14538)
from
$38.99
Carquest Premium Thermostats are manufactured with OEM quality materials and safety standards by an OE Supplier. This thermostat will meet and exceed the expectations of the OE thermostat to insure the best product for your cooling system. Stands up to even the most demanding automotive cooling systems. Manufactured with OEM specifications and processes. Copper case and wax compound assures rapid response to temperature changes in the coolant. Offset design, air relief valve, and OEM style seals included where applicable.
Product Features:
See More
Product Features:
- High grade stainless steel and copper construction
- Meets or exceeds OEM standards
- Consistent and precise response to cooling system needs
- Original equipment design for worry-free direct fit replacement
- 100% tested and calibrated
Carquest Premium – Heavy Duty Thermostat: 175 Degrees (Part No.14857)
from
$64.99
Carquest Premium Thermostats are manufactured with OEM quality materials and safety standards by an OE Supplier. This thermostat will meet and exceed the expectations of the OE thermostat to insure the best product for your cooling system. Stands up to even the most demanding automotive cooling systems. Manufactured with OEM specifications and processes. Copper case and wax compound assures rapid response to temperature changes in the coolant. Offset design, air relief valve, and OEM style seals included where applicable.
Product Features:
See More
Product Features:
- High grade stainless steel and copper construction
- Meets or exceeds OEM standards
- Consistent and precise response to cooling system needs
- Original equipment design for worry-free direct fit replacement
- 100% tested and calibrated
Carquest Premium – Heavy Duty Thermostat: 175 Degrees (Part No.14917)
from
$62.99
Carquest Premium Thermostats are manufactured with OEM quality materials and safety standards by an OE Supplier. This thermostat will meet and exceed the expectations of the OE thermostat to insure the best product for your cooling system. Stands up to even the most demanding automotive cooling systems. Manufactured with OEM specifications and processes. Copper case and wax compound assures rapid response to temperature changes in the coolant. Offset design, air relief valve, and OEM style seals included where applicable.
Product Features:
See More
Product Features:
- High grade stainless steel and copper construction
- Meets or exceeds OEM standards
- Consistent and precise response to cooling system needs
- Original equipment design for worry-free direct fit replacement
- 100% tested and calibrated
Carquest Premium – Heavy Duty Thermostat: With Seal, 180 Degrees (Part No.15198)
from
$55.99
Carquest Premium Thermostats are manufactured with OEM quality materials and safety standards by an OE Supplier. This thermostat will meet and exceed the expectations of the OE thermostat to insure the best product for your cooling system. Stands up to even the most demanding automotive cooling systems. Manufactured with OEM specifications and processes. Copper case and wax compound assures rapid response to temperature changes in the coolant. Offset design, air relief valve, and OEM style seals included where applicable.
Product Features:
See More
Product Features:
- High grade stainless steel and copper construction
- Meets or exceeds OEM standards
- Consistent and precise response to cooling system needs
- Original equipment design for worry-free direct fit replacement
- 100% tested and calibrated
Carquest Premium – Heavy Duty Thermostat: With Seal, 170 Degrees (Part No.15197)
from
$52.99
Carquest Premium Thermostats are manufactured with OEM quality materials and safety standards by an OE Supplier. This thermostat will meet and exceed the expectations of the OE thermostat to insure the best product for your cooling system. Stands up to even the most demanding automotive cooling systems. Manufactured with OEM specifications and processes. Copper case and wax compound assures rapid response to temperature changes in the coolant. Offset design, air relief valve, and OEM style seals included where applicable.
Product Features:
See More
Product Features:
- High grade stainless steel and copper construction
- Meets or exceeds OEM standards
- Consistent and precise response to cooling system needs
- Original equipment design for worry-free direct fit replacement
- 100% tested and calibrated
Top Picks for 1991 Peterbilt 378 Cooling System Filters
Invest in one of our 4 durable Cooling System Filters for your 1991 Peterbilt, knowing you’re getting trusted brands and expert craftsmanship.
Carquest Premium – Coolant Spin-On Filter with BTA PLUS Formula (Part No.96324)
from
$29.99
Carquest Premium Coolant Filters protect your engine’s cooling system by filtering out rust, scale, dirt, and other particles from the coolant fluid. Coolant filters remove contaminants that build up and cause clogging or corrosion in the radiator, water pump, heater core, and engine passages. By keeping the coolant clean and effective, these filters help prevent overheating and ensure optimal engine performance. Carquest Premium Coolant Filters are designed to meet or exceed the performance requirements of the Original Equipment Manufacturer (OEM).
Product Features:
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Product Features:
- Original Equipment Manufacturer (OEM) Design: Designed to meet or exceed OEM performance standards.
- Effective Contaminant Removal:┐Filters out rust, scale, dirt and particulates from coolant fluid.
- Protects Cooling System Components:┐Prevents clogging and corrosion in radiators, water pumps, heater cores, and engine passages.
- Enhances Engine Performance:┐Maintains efficient temperature regulation, preventing overheating.
Carquest Premium – Coolant Spin-On Filter with BTA PLUS Formula (Part No.99065)
from
$71.99
Carquest Premium Coolant Filters protect your engine’s cooling system by filtering out rust, scale, dirt, and other particles from the coolant fluid. Coolant filters remove contaminants that build up and cause clogging or corrosion in the radiator, water pump, heater core, and engine passages. By keeping the coolant clean and effective, these filters help prevent overheating and ensure optimal engine performance. Carquest Premium Coolant Filters are designed to meet or exceed the performance requirements of the Original Equipment Manufacturer (OEM).
Product Features:
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Product Features:
- Original Equipment Manufacturer (OEM) Design: Designed to meet or exceed OEM performance standards.
- Effective Contaminant Removal:┐Filters out rust, scale, dirt and particulates from coolant fluid.
- Protects Cooling System Components:┐Prevents clogging and corrosion in radiators, water pumps, heater cores, and engine passages.
- Enhances Engine Performance:┐Maintains efficient temperature regulation, preventing overheating.
Carquest Premium – Coolant Spin-On Filter with BTA PLUS Formula (Part No.89197)
from
$60.99
Carquest Premium Coolant Filters protect your engine’s cooling system by filtering out rust, scale, dirt, and other particles from the coolant fluid. Coolant filters remove contaminants that build up and cause clogging or corrosion in the radiator, water pump, heater core, and engine passages. By keeping the coolant clean and effective, these filters help prevent overheating and ensure optimal engine performance. Carquest Premium Coolant Filters are designed to meet or exceed the performance requirements of the Original Equipment Manufacturer (OEM).
Product Features:
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Product Features:
- Original Equipment Manufacturer (OEM) Design: Designed to meet or exceed OEM performance standards.
- Effective Contaminant Removal:┐Filters out rust, scale, dirt and particulates from coolant fluid.
- Protects Cooling System Components:┐Prevents clogging and corrosion in radiators, water pumps, heater cores, and engine passages.
- Enhances Engine Performance:┐Maintains efficient temperature regulation, preventing overheating.
Carquest Premium – Coolant Spin-On Filter with BTA PLUS Formula (Part No.89075)
from
$59.99
Carquest Premium Coolant Filters protect your engine’s cooling system by filtering out rust, scale, dirt, and other particles from the coolant fluid. Coolant filters remove contaminants that build up and cause clogging or corrosion in the radiator, water pump, heater core, and engine passages. By keeping the coolant clean and effective, these filters help prevent overheating and ensure optimal engine performance. Carquest Premium Coolant Filters are designed to meet or exceed the performance requirements of the Original Equipment Manufacturer (OEM).
Product Features:
See More
Product Features:
- Original Equipment Manufacturer (OEM) Design: Designed to meet or exceed OEM performance standards.
- Effective Contaminant Removal:┐Filters out rust, scale, dirt and particulates from coolant fluid.
- Protects Cooling System Components:┐Prevents clogging and corrosion in radiators, water pumps, heater cores, and engine passages.
- Enhances Engine Performance:┐Maintains efficient temperature regulation, preventing overheating.
FAQs for 1991 Peterbilt 378 Engine Cooling Parts
What are the best-selling Engine Cooling Parts for 1991 Peterbilt 378s?
Out of 23 Engine Cooling Parts that fit 1991 Peterbilt 378s, the following parts are the top sellers:
- Thermostat: With Seal, 190 Degrees (15480034) – $39.99
- Coolant Spin-On Filter with BTA PLUS Formula (11312226) – $29.99
- Heavy Duty Thermostat: With Seal, 190 Degrees (11330362) – $51.99
What’s the price range for 1991 Peterbilt 378 Engine Cooling Parts?
The prices of Engine Cooling Parts for the 1991 Peterbilt 378 range from $4.99 up to $618.99 for the most premium parts.
What is the average price of an Engine Cooling Part for a 1991 Peterbilt 378?
The average price for Engine Cooling Parts for the 1991 Peterbilt 378 is $97.05. Keep in mind the variety of part types within our Engine Cooling Part category, where you are likely to find a wide range of prices across a variety of parts and components.
Does Advance Auto Parts sell Engine Cooling Parts for other Peterbilt 378 model years?
What are the cheapest Engine Cooling Parts for my 1991 Peterbilt 378?
The cheapest 1991 Peterbilt 378 Engine Cooling Parts we carry are:
- Coolant Temperature Sensor (50215339) – $4.99
- Coolant Temperature Sensor (50215342) – $4.99
- Coolant Spin-On Filter with BTA PLUS Formula (11312226) – $29.99
- Thermostat: With Seal, 160 Degrees (20480066) – $36.99
- Thermostat: With Seal, 180 Degrees (17650013) – $38.99
Does Advance Auto Parts sell Engine Cooling Parts for any other 1991 Peterbilt models?
Yes. We stock Engine Cooling Parts for 10 other popular 1991 Peterbilt models. Some of the most popular are 1991 379 Engine Cooling Parts, 1991 377 Engine Cooling Parts, 1991 357 Engine Cooling Parts, 1991 372 Engine Cooling Parts, and 1991 376 Engine Cooling Parts.
What types of Engine Cooling Parts do you sell for my 1991 Peterbilt 378?
As of 3/1/26, these are some of the most in-demand types of Engine Cooling Parts for a 1991 Peterbilt 378:
Can I get help with 1991 Peterbilt 378 Engine Cooling Part orders?
Contact our customer support team by chat or phone, through the help desk page, where you can find instant answers about Peterbilt Engine Cooling Parts and more.
What is your return policy for Peterbilt 378 Engine Cooling Parts?
Advance Auto Parts keeps returns simple. For new Peterbilt 378 Engine Cooling Parts and accessories, your online orders can be returned, in their original condition, within 45 days. For requirements, see the returns page.