2003 Cadillac CTS Engine Cooling Parts
Keep Your 2003 Cadillac CTS 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 2003 Cadillac CTS looking sharp and performing at its best. At Advance Auto Parts we carry a wide selection of dependable options, including Coolant Reservoir Caps, Thermostat and Water Outlet Assemblies, and Radiators. 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.
Top-Rated Engine Cooling Parts from Trusted Brands
Looking for a reliable Engine Cooling Part? We’ve got you covered with options from brands you know and trust like Carquest Premium, Imperial, and Motorad. For example, Carquest Premium Engine Cooling Parts start at just $15.99 with an average 4.4 star rating. Imperial and Motorad offer similar pricing and quality, backed by strong customer feedback. With over 411 reviews and a solid 4 star average, you can shop with confidence knowing other Cadillac CTS owners approve.
Competitive Prices and Extensive Inventory
The average price for a 2003 Cadillac CTS Engine Cooling Part at Advance Auto Parts is around $78.57, with a range that starts at $4.29 and goes up to $348.31. With 26 options in stock from 9 trusted brands, finding the right fit is easy. Popular picks like Radiator Cap: 15 PSI, Electric Fan, 14" Diameter, and Thermostatic Fan Control – Preset start at just $15.99 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 Blower Motor and Related Products and HVAC Electrical Parts. At Advance Auto Parts, we’re here to help you keep your 2003 Cadillac CTS in peak condition, inside and out.
Find Your Specific 2003 Cadillac CTS Engine Cooling Parts
Looking for the perfect Engine Cooling Part for your 2003 Cadillac CTS? 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 Cadillac CTS. Whether you’re driving a 2003 model or another popular model year like
2011,
2012,
2013,
2014,
2015,
2016,
2017,
2018, and
2019, 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 2003 Cadillac CTS Engine Cooling Parts
Carquest Premium – Radiator Cap Tester Adapter (Part No.12033)
from
$95.99
Tester adapter for the MT-300 cooling system pressure testers. Professional grade test equipment to ensure an automotive cooling system is operating at the correct pressure. Made from high quality materials to ensure durability. Designed to test automotive coolant caps.
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Product Features:
- Machined metal construction
- Works with MT-300 pressure tester
- Tests coolant caps
- Professional quality
NTK – Engine Coolant Temperature Sensor (Part No.EF0173)
from
$34.99
The Engine Coolant Temperature Sensor determines the exact temperature of the engine coolant by sending an analog signal to the ECM to ensure proper air/fuel ratio along with proper operation of the cooling fans and temperature gauge. The Engine Coolant Temperature Sensor may be located on the cylinder head, engine block, thermostat housing or intake manifold. Reasons for replacement include, check engine light illumination, erratic or no temperature gauge operation, erratic or no cooling fan operation, and engine overheating.
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Product Features:
- OE MATCHED: Wires and probe length match OE. Mounting clips included where applicable
- FASTER RESPONSE TIME: Thermal conductive grease inside brass housing increases sensor response time
- THE DIFFERENCE: Thread sealant/o-ring installed where applicable. Thermistor placement within the housing matches OE to ensure proper output. Proper thermal conductive grease to provide accurate temperature transfer to the thermistor
Delphi – Engine Coolant Temperature Sensor (Part No.TS10076)
from
$40.99
Delphi’s history is one of OE heritage and quality. Our global technical requirements include design specifications and validation testing based on over 100 years of OE experience. Our material selections, material thickness, and material types are built from OE specifications to exceed aftermarket expectations. We put in place strict manufacturing processes to ensure quality control in every part we make. Delphi’s pioneering spirit delivers innovative solutions designed to support the aftermarket in servicing the vehicles of today, and tomorrow.
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Product Features:
- Delphi temperature sensors deliver accurate readings and optimal performance
- Delphi’s one-piece design and automated production process eliminates internal connectors and failure points
- Each sensor is electrically insulated to eliminate interference from other components in the vehicle
- Delphi temperature sensors are impervious to electrical noise and interference
Mr. Gasket – Thermocap Radiator Cap (Part No.2476BK)
from
$55.99
The fastest, easiest way to know exactly when it’s safe to open your radiator cap. ThermoCap, with its built-in calibrated thermometer, indicates the coolant temperature.
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Product Features:
- Indicates coolant temperature
- Helps prevent coolant injuries
- Fahrenheit and centigrade readings
- Color-coded temperature ranges
- Integrated coolant reclamation valve
- Improves under-hood appearance
- Chromed crown with a colored trim ring
Mr. Gasket – Thermocap Radiator Cap (Part No.2471S)
from
$51.99
Knowing your coolant temperature can help to prevent burn injuries. Thermocap Cap, with its built-in calibrated thermometer, indicates the coolant temperature. This is useful information prior to cap removal. Never attempt to remove Thermocap Cap when the coolant temperature is very hot. The escaping hot coolant and steam may burn you. Reclamation valve works great with your coolant recovery system. Your radiator can reclaim coolant from your overflow bottle. Wide 30 degree to 270 degree F temperature range. Calibrated in centigrade and Fahrenheit. Color-coded temperature ranges.
Product Features:
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Product Features:
- Indicates Coolant Temperature
- Helps to Prevent Injuries from coolant or steam burns
- Integrated Coolant Reclamation Valve
- Improves Underhood Appearance
- Fahrenheit and centigrade readings
- Various valve pressures available
Felpro – Engine Coolant Thermostat Housing Seal (Part No.35720)
from
$5.99
Fel-Pro® gaskets are specifically designed for the repair environment to deliver a reliable seal on even the most troublesome applications. Designed for imperfect sealing surfaces and manufactured with proprietary materials, you can count on Fel-Pro for innovative sealing solutions for the real-world repair environment.
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Product Features:
- Meets or exceeds all original equipment specifications
- Application specific design to ensure a perfect fit
- Engineered and manufactured specifically for the repair environment
- Unsurpassed quality you can trust
- Each Fel-Pro gasket, no matter how small, is engineered to exacting standards with proprietary design, engineering and manufacturing processes
GM Genuine Parts – Engine Coolant Outlet O-Ring (Part No.15-32584)
from
$6.99
GM Genuine Parts Multi Purpose O-Rings are designed, engineered, and tested to rigorous standards, and are backed by General Motors. GM Genuine Parts are the true OE parts installed during the production of or validated by General Motors for GM vehicles. Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE).
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Product Features:
- Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE)
- GM Genuine Parts are designed, engineered and tested to rigorous standards, and are backed by General Motors
- GM Engineers design and validate OE parts specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle
- GM regularly updates production and service part designs to integrate new materials and technologies
Carquest Premium – Radiator: With Transmission Oil Cooler (Part No.434014)
from
$298.99
Carquest Premium radiators are designed and engineered for maximum performance, using the highest-grade materials to ensure all radiators meet or exceed original equipment (O.E.) fit, form and function. Carquest Premium radiators are built by manufacturers that meet IATF 16949 certified framework, an internationally recognized proof of quality in the automotive industry. Most modern vehicles use radiators with plastic tanks and our parts are engineered with integrated ribbing to prevent damage during thermal cycling. Carquest Premium radiators are also 100% tested to ensure a durable, leak-free cooling system repair.
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Product Features:
- Thermal tested under real-life temperature simulations
- High tensile strength aluminum for maximum crimp strength
- Plastic tanks are engineeredáwith integrated ribbingáfor addedástrength to withstand cracks, bowing and distortion during thermal cycles
- Thermal expansion slots extend core life and reduce failure rates by allowing improved core expansion and contraction during systematic heat cycles
Carquest Premium – Radiator: With Transmission Oil Cooler (Part No.813597)
from
$254.99
Carquest Premium radiators are designed and engineered for maximum performance, using the highest-grade materials to ensure all radiators meet or exceed original equipment (O.E.) fit, form and function. Carquest Premium radiators are built by manufacturers that meet IATF 16949 certified framework, an internationally recognized proof of quality in the automotive industry. Most modern vehicles use radiators with plastic tanks and our parts are engineered with integrated ribbing to prevent damage during thermal cycling. Carquest Premium radiators are also 100% tested to ensure a durable, leak-free cooling system repair.
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Product Features:
- Thermal tested under real-life temperature simulations
- High tensile strength aluminum for maximum crimp strength
- Plastic tanks are engineeredáwith integrated ribbingáfor addedástrength to withstand cracks, bowing and distortion during thermal cycles
- Thermal expansion slots extend core life and reduce failure rates by allowing improved core expansion and contraction during systematic heat cycles
Dorman – Engine Heater Hose Assembly (Part No.626-536)
from
$80.99
This engine water pump inlet tube is designed to match the fit and function of the original tube on specified applications, and is engineered for reliable performance and durability.
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Product Features:
- Direct replacement – this engine water pump inlet tube is designed to match the fit and function of the original tube on specified applications
- Restores functionality – reliable replacement for an original part that has failed due to corrosion from heat and water cycling
- Durable construction – this part is made from quality materials to ensure reliable performance and long service life
- Trustworthy quality – backed by team of product experts in the United States and more than a century of automotive experience
Imperial – Adjustable Thermostatic Fan Control (Part No.226204)
from
$65.99
Adjustable Thermostatic Fan Control. 160-210°F; push-in probe. Controls the operating temperature of Imperial electric fans. Operates up to 2 fans.
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Product Features:
- Adjustable thermostatic fan control
- 160-210°F push-in probe
- For use with Imperial electric fans
- Probe installs into radiator fins
Imperial – Thermostatic Fan Control – Preset (Part No.226206)
from
$46.99
Our products are engineered and tested to provide years of trouble free operation. Backed by over 50 years of mobile a/c experience, fix it once and fix it right with Imperial.
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Product Features:
- Preset thermostatic fan control
- 185 Deg. F preset
- For use with Imperial electric fans
- Probe installs into radiator fins
- Contains gaskets, O-rings, or seals to properly replace the product
- Brass construction for accurate temperature sensing
- Zinc coated terminal to resist corrosion
- Vehicle specific applications
Imperial – Thermostatic Fan Control – Adjustable (Part No.226208)
from
$69.99
Our products are engineered and tested to provide years of trouble free operation. Backed by over 50 years of mobile a/c experience, fix it once and fix it right with Imperial.
Product Features:
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Product Features:
- Adjustable thermostatic fan control
- 160 Deg. F – 210 Deg. F thread-in probe
- For use with Imperial electric fans
- Thread-in probe for installation in water jacket or radiator
- Contains gaskets, O-rings, or seals to properly replace the product
- Brass construction for accurate temperature sensing
- Zinc coated terminal to resist corrosion
- Vehicle specific applications
Carquest Premium – Coolant Housing/Water Outlet: Gasket Included (Part No.85251)
from
$55.99
We are proud to offer this Carquest product line: Carquest Water Outlets. Our products are engineered and tested to provide years of trouble free operation and designed to be hassle free OE replacement part that meets and/or exceeds OE standards. Backed by over 50 years of mobile temperature control experience, fix it once and fix it right with CARQUST Water Outlets and Thermostat Housings.
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Product Features:
- Meets and/or exceeds OEM standard
- Includes quality gasket or O-ring to ensure proper seal (where applicable))
- Coated with corrosion and rust inhibitor
- 100% leak tested
- Direct-fit replacement for ease of installation
- Meets and/or exceeds OEM standard
- Includes quality gasket or O-ring to ensure proper seal (where applicable)
- Coated with corrosion and rust inhibitor
- 100% leak tested
- Direct-fit replacement for ease of installation
Dorman – Engine Coolant Water Outlet with Sensor (Part No.902-2134)
from
$101.99
This replacement engine coolant water outlet is engineered to match the fit and durability of the stock engine coolant water outlet on specified vehicles. It is designed to withstand extreme temperature changes to extend service life.
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Product Features:
- Ideal replacement – this engine coolant water outlet directly replaces the original water outlet on specified vehicle years, makes and models
- Durable construction – this part is specifically designed to withstand extreme temperature changes and resist cracking and leaking
- Cost-effective and reliable – offers original manufacturer quality at lower cost than getting replacement at dealer
- Industry-leading design – professionally engineered by the aftermarket leader in replacement water outlets
Carquest Premium – Engine Coolant Water Outlet (Part No.85083)
from
$26.49
Direct-fit replacement for ease of installation
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Product Features:
- Meets and/or exceeds OEM standard
- Direct-fit replacement for ease of installation
- 100% leak tested
- Meets and/or exceeds OEM standard
- 100% leak tested
- Direct-fit replacement for ease of installation
Carquest Premium – Engine Water Pump: New, Gasket/Seals Included (Part No.T2395)
from
$131.99
Carquest Premium water pumps are 100% new, high-quality parts that meet or exceed original equipment (O.E.) specifications. All components, including the housing, hub, bearings, gaskets and seals are designed for long-lasting service life. These water pumps are supplied with the gaskets or seals necessary for installation. Our Carquest Premium water pumps undergo stringent testing to ensure superior performance that we stand behind with an industry-leading warranty.
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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
Edelbrock – Water Pump Two-piece for 1997-04 GM LS1/LS6 Gen III in Satin Finish (Part No.8896)
from
$494.99
Edelbrock #8896 Water Pump GM gen III ls1 & gen iv ls engines insert style ideal to prevent overheating in street rods and street machines, as well as in tow rigs and motorhomes. Using state-of-the-art racing technology, Edelbrock has designed these “supe
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Product Features:
- Standard Impeller Rotation
- 0.750 in. Pilot Shaft
- 0.750 in. Ball/Ball Bearing
- 6.00 in. Block To Hub Height
- Satin Finish
Carquest Premium – Engine Water Pump: New, Gasket/Seals Included (Part No.T6057)
from
$194.99
Carquest Premium water pumps are 100% new, high-quality parts that meet or exceed original equipment (O.E.) specifications. All components, including the housing, hub, bearings, gaskets and seals are designed for long-lasting service life. These water pumps are supplied with the gaskets or seals necessary for installation. Our Carquest Premium water pumps undergo stringent testing to ensure superior performance that we stand behind with an industry-leading warranty.
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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
Carquest Premium – Radiator Cap: 15 PSI (Part No.10248)
from
$15.99
Crafted to meet the exact specifications set by Original Equipment Manufacturers (OEM), these products are engineered for effortless installation and removal. Constructed from premium-grade components, incorporating proper relief and vacuum valves, they ensure optimal performance even in the most demanding automotive cooling systems. Rigorously quality-tested, these components provide exceptional, out-of-the-box performance and superior durability to meet or exceed the highest standards of today’s vehicles.
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Product Features:
- Maintains proper cooling system pressure
- Easy installation and removal
- 100% tested to ensure proper pressure and longevity
- Meets all OEM specifications
Dorman – Radiator Fan Assembly (Part No.621-984)
from
$609.99
This engine cooling fan assembly is precision-engineered to match the fit and performance of the stock radiator fan on specific vehicle years, makes and models. It has been rigorously tested to ensure it cools as effectively as the original part.
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Product Features:
- Ideal replacement – this engine cooling fan assembly was precision-engineered to match the fit and performance of the stock radiator fan assembly on specific vehicles
- Complete package – assembly is designed with the same materials and components as the original part
- Quality assured – motors are tested in laboratory settings to ensure performance
- Cost effective and reliable – trustworthy manufacturing for far less than same part at the dealership
Imperial – Electric Fan, 14" Diameter (Part No.226114)
from
$99.99
Our products are engineered and tested to provide years of trouble free operation. Backed by over 50 years of mobile a/c experience, fix it once and fix it right with Imperial.
Product Features:
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Product Features:
- Motors built and tested to quality specifications
- 14 in. universal fit reversible fan
- 1250 CFM
- UNIVERSAL fan, NOT a direct OE replacement. Measure core and verify space.
- Motors built and tested to quality specifications
- 14 in. universal fit reversible fan
- 1250 CFM
- UNIVERSAL fan, NOT a direct OE replacement. Measure core and verify space.
Dorman – Radiator Fan Assembly: Single, Cost Effective and Reliable (Part No.620-567)
from
$182.99
This engine cooling fan assembly is precision-engineered to match the fit and performance of the stock radiator fan on specific vehicle years, makes and models. It has been rigorously tested to ensure it cools as effectively as the original part.
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Product Features:
- Ideal replacement – this engine cooling fan assembly was precision-engineered to match the fit and performance of the stock radiator fan assembly on specific vehicles
- Complete package – assembly is designed with the same materials and components as the original part
- Quality assured – motors are tested in laboratory settings to ensure performance
- Cost effective and reliable – trustworthy manufacturing for far less than same part at the dealership
Dorman – Radiator Fan Assembly: Dual, Cost Effective and Reliable (Part No.620-580)
from
$595.99
This engine cooling fan assembly is precision-engineered to match the fit and performance of the stock radiator fan on specific vehicle years, makes and models. It has been rigorously tested to ensure it cools as effectively as the original part.
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Product Features:
- Ideal replacement – this engine cooling fan assembly was precision-engineered to match the fit and performance of the stock radiator fan assembly on specific vehicles
- Complete package – assembly is designed with the same materials and components as the original part
- Quality assured – motors are tested in laboratory settings to ensure performance
- Cost effective and reliable – trustworthy manufacturing for far less than same part at the dealership
Motorad – Integrated Thermostat Housing: With Gasket, 180 Degrees (Part No.639-180)
from
$233.99
Manufactured with OEM quality materials and safety standards by an OE Supplier. 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.
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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
Motorad – Integrated Thermostat Housing: With Gasket, 180 Degrees (Part No.1020-180)
from
$117.99
Manufactured with OEM quality materials and safety standards by an OE Supplier. 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.
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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 – Integrated Thermostat Housing: With Seal, 174 Degrees (Part No.349-174)
from
$65.99
Carquest Premium Integrated Housing Thermostats are manufactured with OEM quality materials and safety standards by an OE Supplier. This integrated thermostat housing 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 as well as the design and function of the housing. 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
Dorman – Thermostat Assembly: Includes Housing, Bolts, and Gasket, 212 Degrees (Part No.902-2121)
from
$163.99
This replacement engine coolant thermostat housing assembly is engineered to match the fit and durability of the stock housing assembly on specified vehicles. It is designed to withstand extreme temperature changes to extend service life.
Product Features:
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Product Features:
- Ideal replacement – this engine coolant thermostat housing assembly directly replaces the original water outlet on specified vehicle years, makes and models.
- Durable construction – this part is specifically designed to withstand extreme temperature changes and resist cracking and leaking.
- Cost-effective and reliable – offers original manufacturer quality at lower cost than getting replacement at dealer
- Industry-leading design – professionally engineered by the aftermarket leader in replacement thermostat housing assemblies
Popular 2003 Cadillac CTS Engine Cooling Parts Categories
Most Popular Coolant Reservoir Cap for 2003 Cadillac CTSs
Enhance your 2003 Cadillac CTS with this popular Coolant Reservoir Cap we have in stock, for $15.99.
Carquest Premium – Radiator Cap: 15 PSI (Part No.10248)
from
$15.99
Crafted to meet the exact specifications set by Original Equipment Manufacturers (OEM), these products are engineered for effortless installation and removal. Constructed from premium-grade components, incorporating proper relief and vacuum valves, they ensure optimal performance even in the most demanding automotive cooling systems. Rigorously quality-tested, these components provide exceptional, out-of-the-box performance and superior durability to meet or exceed the highest standards of today’s vehicles.
Product Features:
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Product Features:
- Maintains proper cooling system pressure
- Easy installation and removal
- 100% tested to ensure proper pressure and longevity
- Meets all OEM specifications
Best-Selling 2003 Cadillac CTS Thermostat and Water Outlet Assemblies
Upgrade your CTS with one of our 5 best-selling Thermostat and Water Outlet Assemblies, earning an average 5 stars rating across 2 reviews.
Motorad – Integrated Thermostat Housing: With Seal, 198 Degrees (Part No.349-198)
from
$29.99
Manufactured with OEM quality materials and safety standards by an OE Supplier. 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 – Integrated Thermostat Housing: With Seal, 174 Degrees (Part No.349-174)
from
$65.99
Carquest Premium Integrated Housing Thermostats are manufactured with OEM quality materials and safety standards by an OE Supplier. This integrated thermostat housing 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 as well as the design and function of the housing. 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
Dorman – Thermostat Assembly: Includes Housing, Thermostat, and Gasket, 198 Degrees (Part No.902-691)
from
$57.99
This replacement engine coolant thermostat housing assembly is engineered to match the fit and durability of the stock housing assembly on specified vehicles. It is designed to withstand extreme temperature changes to extend service life.
Product Features:
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Product Features:
- Ideal replacement – this engine coolant thermostat housing assembly directly replaces the original water outlet on specified vehicle years, makes and models
- Durable construction – this part is specifically designed to withstand extreme temperature changes and resist cracking and leaking
- Cost-effective and reliable – offers original manufacturer quality at lower cost than getting replacement at dealer
- Industry-leading design – professionally engineered by the aftermarket leader in replacement thermostat housing assemblies
Carquest Premium – Integrated Thermostat Housing: With Seal, 180 Degrees (Part No.349-180)
from
$50.99
Carquest Premium Integrated Housing Thermostats are manufactured with OEM quality materials and safety standards by an OE Supplier. This integrated thermostat housing 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 as well as the design and function of the housing. 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
Dorman – Thermostat Assembly: Includes Gasket, Housing, and Thermostat, 180 Degrees (Part No.902-2691)
from
$41.99
This replacement engine coolant thermostat housing assembly is engineered to match the fit and durability of the stock housing assembly on specified vehicles. It is designed to withstand extreme temperature changes to extend service life.
Product Features:
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Product Features:
- Ideal replacement – this engine coolant thermostat housing assembly directly replaces the original water outlet on specified vehicle years, makes and models
- Durable construction – this part is specifically designed to withstand extreme temperature changes and resist cracking and leaking
- Cost-effective and reliable – offers original manufacturer quality at lower cost than getting replacement at dealer
- Industry-leading design – professionally engineered by the aftermarket leader in replacement thermostat housing assemblies
Top-Quality Radiators for 2003 Cadillac CTSs
Choose a high-quality OEM or aftermarket Radiator for Cadillac CTSs and enjoy top-notch performance from $222.99.
Carquest Premium – Radiator: With Transmission Oil Cooler (Part No.438182)
from
$222.99
Carquest Premium radiators are designed and engineered for maximum performance, using the highest-grade materials to ensure all radiators meet or exceed original equipment (O.E.) fit, form and function. Carquest Premium radiators are built by manufacturers that meet IATF 16949 certified framework, an internationally recognized proof of quality in the automotive industry. Most modern vehicles use radiators with plastic tanks and our parts are engineered with integrated ribbing to prevent damage during thermal cycling. Carquest Premium radiators are also 100% tested to ensure a durable, leak-free cooling system repair.
Product Features:
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Product Features:
- Thermal tested under real-life temperature simulations
- High tensile strength aluminum for maximum crimp strength
- Plastic tanks are engineeredáwith integrated ribbingáfor addedástrength to withstand cracks, bowing and distortion during thermal cycles
- Thermal expansion slots extend core life and reduce failure rates by allowing improved core expansion and contraction during systematic heat cycles
TYC – Genera Radiator (Part No.G1000583575TYC)
from
$348.31
Plastic Tank / Aluminum Core Radiator To ensure the highest cooling efficiency, TYC brand Radiators are designed comparable to Original Equipment construction from number of fluid tubes to number and placement of cooling fins.
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Product Features:
- OE-Equivalent
- All Aluminum with plastic end tanks
- Direct fit for easy installation
- High quality corrosion resistant materials
- OE Style mounting brackets, fittings and hose connections
- Integrated transmission oil cooler when applicable
Top Picks for 2003 Cadillac CTS Radiator Caps
Invest in one of our 2 durable Radiator Caps for your 2003 Cadillac, knowing you’re getting trusted brands and expert craftsmanship.
Mr. Gasket – Thermocap Radiator Cap (Part No.2471S)
from
$51.99
Knowing your coolant temperature can help to prevent burn injuries. Thermocap Cap, with its built-in calibrated thermometer, indicates the coolant temperature. This is useful information prior to cap removal. Never attempt to remove Thermocap Cap when the coolant temperature is very hot. The escaping hot coolant and steam may burn you. Reclamation valve works great with your coolant recovery system. Your radiator can reclaim coolant from your overflow bottle. Wide 30 degree to 270 degree F temperature range. Calibrated in centigrade and Fahrenheit. Color-coded temperature ranges.
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Product Features:
- Indicates Coolant Temperature
- Helps to Prevent Injuries from coolant or steam burns
- Integrated Coolant Reclamation Valve
- Improves Underhood Appearance
- Fahrenheit and centigrade readings
- Various valve pressures available
Mr. Gasket – Thermocap Radiator Cap (Part No.2476BK)
from
$55.99
The fastest, easiest way to know exactly when it’s safe to open your radiator cap. ThermoCap, with its built-in calibrated thermometer, indicates the coolant temperature.
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Product Features:
- Indicates coolant temperature
- Helps prevent coolant injuries
- Fahrenheit and centigrade readings
- Color-coded temperature ranges
- Integrated coolant reclamation valve
- Improves under-hood appearance
- Chromed crown with a colored trim ring
Our Top-Rated Water Pumps for 2003 Cadillac CTSs
Make a smart move for your 2003 Cadillac CTS with our Water Pump for $79.99.
Carquest Premium – Engine Water Pump: New, Gasket/Seals Included (Part No.T1162)
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$79.99
Carquest Premium water pumps are 100% new, high-quality parts that meet or exceed original equipment (O.E.) specifications. All components, including the housing, hub, bearings, gaskets and seals are designed for long-lasting service life. These water pumps are supplied with the gaskets or seals necessary for installation. Our Carquest Premium water pumps undergo stringent testing to ensure superior performance that we stand behind with an industry-leading warranty.
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
Top-Rated Engine Cooling Part Brands For Your 2003 Cadillac CTS
When it comes to finding the perfect Engine Cooling Part for your 2003 Cadillac CTS, Advance Auto Parts has you covered with a wide selection of high-quality OEM and aftermarket options from 9 trusted brands. We carry the most popular Engine Cooling Part brands including Carquest Premium, Motorad, and Imperial, and more, all known for their exceptional customer ratings (average brand rating of 4.4 stars) and competitive prices, as low as $15.99. Purchasing a Engine Cooling Part from us here at Advance Auto Parts is a smart move for both you and your 2003 Cadillac CTS, providing peace of mind with parts that meet or exceed OEM standards.
Popular Carquest Premium 2003 Cadillac CTS Engine Cooling Parts
If you’re looking for a top-quality Engine Cooling Part for your 2003 Cadillac CTS, Advance Auto Parts has exactly what you need with our selection of Carquest Premium Engine Cooling Parts. We have 2 Carquest Premium Engine Cooling Parts in stock for this fitment, all known for their durability and precision fit. With prices starting at just $15.99 and an average cost of $47.99, you’ll find the perfect Engine Cooling Part for your needs and budget. Carquest Premium Engine Cooling Parts for the 2003 Cadillac CTS come highly rated, with over 65 customer reviews and an impressive average rating of 4.4 stars. Choosing a Carquest Premium Engine Cooling Part from Advance Auto Parts is a smart move to ensure quality and value for your vehicle.
Top-Quality Motorad 2003 Cadillac CTS Engine Cooling Parts
For those in search of a high-quality Engine Cooling Part for their 2003 Cadillac CTS, Advance Auto Parts offers a great selection of Motorad Engine Cooling Parts. With 1 Motorad Engine Cooling Parts in stock, you can trust you’re getting top-tier parts designed for durability and a perfect fit. Prices for these Engine Cooling Parts start at just $29.99, giving you a range of options to suit your budget. Backed by over 2 customer ratings and an average rating of 4.3 stars, Motorad Engine Cooling Parts provide both reliability and excellent performance. Choosing a Motorad Engine Cooling Part from Advance Auto Parts is a smart investment in your vehicle’s performance and longevity.
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$29.99
(2)
Integrated Thermostat Housing: With Seal, 198 Degrees
“Housing and thermostat together made for easier installation.”
FAQs for 2003 Cadillac CTS Engine Cooling Parts
What are the best-selling Engine Cooling Parts for 2003 Cadillac CTSs?
Out of 26 Engine Cooling Parts that fit 2003 Cadillac CTSs, the following parts are the top sellers:
- Radiator Cap: 15 PSI (17110030) – $15.99
- Electric Fan, 14" Diameter (6014933) – $99.99
- Thermostatic Fan Control – Preset (3670008) – $46.99
What’s the price range for 2003 Cadillac CTS Engine Cooling Parts?
The prices of Engine Cooling Parts for the 2003 Cadillac CTS range from $4.29 up to $348.31 for the most premium parts.
What is the average price of an Engine Cooling Part for a 2003 Cadillac CTS?
The average price for Engine Cooling Parts for the 2003 Cadillac CTS is $78.57. 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 Cadillac CTS model years?
What are the cheapest Engine Cooling Parts for my 2003 Cadillac CTS?
The cheapest 2003 Cadillac CTS Engine Cooling Parts we carry are:
- O-RING (20689010) – $4.29
- Radiator Cap: 15 PSI (17110030) – $15.99
- Coolant Temperature Sensor (11481426) – $18.99
- Coolant Temperature Sensor 1TS1026 (12422821) – $21.99
- Adjustable Thermostatic Fan Control (6016936) – $23.99
Does Advance Auto Parts sell Engine Cooling Parts for any other 2003 Cadillac models?
Yes. We stock Engine Cooling Parts for 4 other popular 2003 Cadillac models. Some of the most popular are 2003 Escalade Engine Cooling Parts, 2003 Escalade ESV Engine Cooling Parts, 2003 Escalade EXT Engine Cooling Parts, 2003 DeVille Engine Cooling Parts, and 2003 Seville Engine Cooling Parts.
What are the top-rated Engine Cooling Parts that fit the 2003 Cadillac CTS?
Based on 411 reviews by customers, our 2003 Cadillac CTS Engine Cooling Parts have an average customer rating of 4 stars. These are the highest-rated categories of Engine Cooling Parts for the 2003 Cadillac CTS and their top-rated products:
- Radiator Caps
- Thermocap Radiator Cap (6900022) – $51.99
- Radiator Fan Motors
- Electric Fan, 14" Diameter (6014933) – $99.99
- Electric Fan, 12" Diameter (6016901) – $108.99
What types of Engine Cooling Parts do you sell for my 2003 Cadillac CTS?
As of 11/2/25, these are some of the most in-demand types of Engine Cooling Parts for a 2003 Cadillac CTS:
Can I get help with 2003 Cadillac CTS 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 Cadillac Engine Cooling Parts and more.
What is your return policy for Cadillac CTS Engine Cooling Parts?
Advance Auto Parts keeps returns simple. For new Cadillac CTS Engine Cooling Parts and accessories, your online orders can be returned, in their original condition, within 45 days. For requirements, see the returns page.