2003 Mercury Grand Marquis Engine Cooling Parts

Keep Your 2003 Mercury Grand Marquis 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 Mercury Grand Marquis looking sharp and performing at its best. At Advance Auto Parts we carry a wide selection of dependable options, including Radiators, Radiator Caps, and Water Pumps. 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, Dorman, and FELPRO. For example, Carquest Premium Engine Cooling Parts start at just $14.29 with an average 4.4 star rating. Dorman and FELPRO offer similar pricing and quality, backed by strong customer feedback. With over 1,110 reviews and a solid 4 star average, you can shop with confidence knowing other Mercury Grand Marquis owners approve.

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 Mercury Grand Marquis in peak condition, inside and out.

Essential 2003 Mercury Grand Marquis Engine Cooling Parts

Motorad – Thermostat Kit: Includes Housing, Thermostat and Seal, 195 Degrees (Part No.5617KT)

Thermostat Kit: Includes Housing, Thermostat and Seal, 195 Degrees

from

$28.99
Kit includes thermostat, housing, and all necessary seals/gaskets to do the complete job. These individual parts are manufactured with OEM quality materials and safety standards by an OE Supplier. This thermostat and 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. Offset design, air relief valve, and OEM style seals included where applicable.

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
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Motorcraft – Water Temperature Senders (Part No.P4036648489MTR)

Water Temperature Senders

from

$60.69
Motorcraft Water Temperature Senders are designed for durability and electrical performance in Ford and Lincoln vehicles.

Product Features:
  • They feature threads and a seal that are matched to the vehicle application – no one-size-fits-all solution
  • Coolant temperature senders have the proper output curve to work with the vehicle temperature gauge, which helps prevent misreading
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Carquest Premium – Radiator: With Transmission Oil Cooler (Part No.433552)

Radiator: With Transmission Oil Cooler

from

$464.99
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:
  • 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
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Carquest Premium – Standard Thermostat: 160 Degrees (Part No.13356)

Standard Thermostat: 160 Degrees

from

$9.99
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:
  • 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
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Dorman – Help – Engine Coolant Reservoir Cap: Twist, Plastic, 1 Pack (Part No.54208)

Engine Coolant Reservoir Cap: Twist, Plastic, 1 Pack

from

$15.99
Cracked or lost the original engine coolant reservoir cap? Replace it seamlessly and effectively with this precisely engineered, direct replacement cap.

Product Features:
  • Direct replacement – this engine coolant reservoir cap directly replaces a cracked or lost original cap.
  • Application specific – made to match dimensions of reservoir cap on only certain vehicle years, makes and models
  • Seamless fit – reverse-engineered from the original equipment to fit perfectly
  • Excellent value – a quick, easy replacement that’s less expensive than going back to the dealership
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Dorman – Pressurized Coolant Reservoir: Black And White, Plastic, Original Equipment Replacement (Part No.603-050)

Pressurized Coolant Reservoir: Black And White, Plastic, Original Equipment Replacement

from

$67.99
This replacement engine coolant reservoir is manufactured from quality materials to withstand the stresses of underhood heat and engine vibration. It is engineered and manufactured to match the fit and function of the original part.

Product Features:
  • Direct replacement – this engine coolant reservoir matches the fit and function of the original part.
  • Ideal solution – engineered for a seamless installation.
  • Durable construction – manufactured from quality materials to withstand underhood heat and vibration
  • Trustworthy design – backed by 100 years of automotive aftermarket experience
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Dorman – Help – Radiator Drain Cocks (Part No.61108)

Radiator Drain Cocks

from

$5.79
This radiator drain petcock is a direct replacement for the original equipment plug that may have deteriorated or corroded. Made of quality materials, this petcock is engineered to strict standards for durable use over time.

Product Features:
  • Direct replacement – this radiator drain petcock matches the fit and function of the original equipment part.
  • Durable construction – this part is made of quality materials for a long service life
  • Saves money – offers original equipment quality at a competitive price
  • Quality assured – this petcock has undergone virtual testing to assure proper fit and function
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Carquest Premium – Coolant Temperature Sensor with Thread Sealant (Part No.WTC1015)

Coolant Temperature Sensor with Thread Sealant

from

$24.99
Approved materials for increased durability in even the most extreme temperatures. All MotoRad Coolant Temperature Sensors are designed to meet or exceed OEM specifications at our ISO TS16949 manufacturing facilities.

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.
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KAI – Radiator Support Tie Bar (Part No.FO1225178)

Radiator Support Tie Bar

from

$60.99
New Standard Replacement Radiator Support Lower Tie Bar

Product Features:
  • Made Of Steel
  • Meets All Federal Motor Safety Standards
  • No Drilling Needed For Installation
  • No Modifications Needed For Installation
  • Direct Fit Replacement For Your Vehicle
  • Same Form Fit And Function As OE
  • Check Out The Large Selection Of Parts Available For Your Vehicle
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Felpro – Engine Coolant Outlet Gasket (Part No.35067)

Engine Coolant Outlet Gasket

from

$3.29
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.

Product Features:
  • Meets or exceeds all original equipment specifications
  • Application specific design to ensure a perfect fit
  • Manufactured for the sealing repair environment
  • Validated for fit, form, and function
  • Quality that you can trust
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Carquest Premium – Radiator Cap: 16 PSI (Part No.10331)

Radiator Cap: 16 PSI

from

$16.79
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:
  • Safety lever to vent coolant pressure before removal
  • Maintains proper cooling system pressure
  • Easy installation and removal
  • 100% tested to ensure proper pressure and longevity
  • Meets all OEM specifications
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Dorman – Radiator Fan Assembly: Single, Upgraded Controller, OE Fix, Reliable (Part No.621-353XD)

Radiator Fan Assembly: Single, Upgraded Controller, OE Fix, Reliable

from

$247.99
Engine cooling fans often burn out because they’re under-engineered for extreme duty. This Dorman OE FIX solution features upgraded computer control chips, a more effective heat sink and enhanced software to perform at higher temperatures longer. Every Dorman part is backed by over 100 years of experience, along with a dedicated team of product experts, automotive engineers and technical support specialists based in the United States. We are passionate about giving repair professionals and vehicle owners greater freedom to fix cars and trucks, which is why we have more than 100,000 parts in our catalog today and promise to never stop driving new solutions.

Product Features:
  • Upgraded design – this replacement radiator fan assembly features multiple enhancements over original equipment to improve longevity and performance
  • Improved heat dissipation – features a smart circuit board layout, heat sink design and thermal pad for to prevent burn out
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Carquest Premium – Engine Cooling Fan Motor Relay (Part No.RAC2614)

Engine Cooling Fan Motor Relay

from

$177.99
Carquest premium engine management products provide the right products for a wide range of domestic and import applications. Delivering the highest performance and durability under demanding conditions.
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Dorman – Panel Trim Retainer – Interior – Ford (Sold by each) (Part No.700-335)

Panel Trim Retainer - Interior - Ford (Sold by each)

from

$0.99
Constructed of quality materials, this multi-purpose retainer provides the same function and versatility as the original equipment retainer ensuring long service life.

Product Features:
  • Ideal replacement – this retainer matches the fit and function of the original equipment retainer for this vehicle application.
  • Quality material – this retainer is made of durable material for long-lasting service
  • Versatile design – this retainer is suitable for a variety of automotive uses
  • Excellent value – this part offers original equipment quality at a competitive cost
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Carquest Premium – Engine Water Pump: New, Gasket/Seals Included (Part No.T4206)

Engine Water Pump: New, Gasket/Seals Included

from

$66.99
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:
  • 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
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Felpro – Engine Water Pump Bypass Pipe O-Ring Kit (Part No.ES 73048)

Engine Water Pump Bypass Pipe O-Ring Kit

from

$6.79
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.

Product Features:
  • Meets or exceeds all original equipment specifications
  • Application specific design to ensure a perfect fit
  • Manufactured for the sealing repair environment
  • Validated for fit, form, and function
  • Unsurpassed quality you can trust
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Felpro – Engine Water Pump Gasket (Part No.35211)

Engine Water Pump Gasket

from

$2.99
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.

Product Features:
  • Meets or exceeds all original equipment specifications
  • Application specific design
  • Manufactured for the sealing repair environment
  • Validated for fit, form, and function
  • Quality that you can trust
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Felpro – Multi-Purpose O-Ring (Part No.35489)

Multi-Purpose O-Ring

from

$9.99
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.

Product Features:
  • Meets or exceeds all original equipment specifications
  • Application specific design
  • Manufactured for the sealing repair environment
  • Validated for fit, form, and function
  • Quality that you can trust
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Imperial – Adjustable Thermostatic Fan Control (Part No.226204)

Adjustable Thermostatic Fan Control

from

$63.99
Adjustable Thermostatic Fan Control. 160-210°F; push-in probe. Controls the operating temperature of Imperial electric fans. Operates up to 2 fans.

Product Features:
  • Adjustable thermostatic fan control
  • 160-210°F push-in probe
  • For use with Imperial electric fans
  • Probe installs into radiator fins
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Stant – Thermostat O-Ring (Part No.G4030195862STN)

Thermostat O-Ring

from

$4.55
Thermostat O-Ring

Carquest Premium – Coolant Housing/Water Outlet: Gasket Included (Part No.84876)

Coolant Housing/Water Outlet: Gasket Included

from

$23.99
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.

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
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Carquest Premium – Coolant Housing/Water Outlet: Gasket Included (Part No.85102)

Coolant Housing/Water Outlet: Gasket Included

from

$43.49
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.

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
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Carquest Premium – Electronic Automatic Temperature Control Sensor Connector (Part No.PTA3307)

Electronic Automatic Temperature Control Sensor Connector

from

$51.99
CARQUEST premium engine management products provide the right products for a wide range of domestic and import applications. Delivering the highest performance and durability under demanding conditions.
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Carquest Premium – Universal Fan Clutch – 7" Thermal Regular Duty (Part No.215126)

Universal Fan Clutch - 7" Thermal Regular Duty

from

$61.99
Product Features:
  • Designed, tested, and built by application
  • OE performance, fit, and appearance
  • Precision machined
  • Out of box installation
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Carquest Premium – Universal Fan Clutch – 6" Thermal (Part No.215165)

Universal Fan Clutch - 6" Thermal

from

$60.99
Product Features:
  • Designed, tested, and built by application
  • OE performance, fit, and appearance
  • Precision machined
  • Out of box installation
See More

Dorman – Coolant Housing/Water Outlet: with Housing and Gasket, 60 Degree Neck Angle (Part No.902-1001)

Coolant Housing/Water Outlet: with Housing and Gasket, 60 Degree Neck Angle

from

$12.49
This replacement engine coolant thermostat housing is engineered to match the fit and durability of the stock thermostat housing on specified vehicles. It is designed to withstand extreme temperature changes to extend service life.

Product Features:
  • Ideal replacement – this engine coolant thermostat housing directly replaces the original housing 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 housings
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Dorman – Coolant Housing/Water Outlet: with Housing and Gasket, 180 Degree Neck Angle (Part No.902-1033)

Coolant Housing/Water Outlet: with Housing and Gasket, 180 Degree Neck Angle

from

$12.99
This replacement engine coolant thermostat housing is engineered to match the fit and durability of the stock thermostat housing on specified vehicles. It is designed to withstand extreme temperature changes to extend service life.

Product Features:
  • Ideal replacement – this engine coolant thermostat housing directly replaces the original housing 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 housings
See More

Dorman – Coolant Housing/Water Outlet: with Water Outlet and O-Ring, 20 Degree Neck Angle (Part No.902-899)

Coolant Housing/Water Outlet: with Water Outlet and O-Ring, 20 Degree Neck Angle

from

$18.79
This replacement engine coolant thermostat housing is engineered to match the fit and durability of the stock thermostat housing on specified vehicles. It is designed to withstand extreme temperature changes to extend service life.

Product Features:
  • Ideal replacement – this engine coolant thermostat housing directly replaces the original housing 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 housings
See More

Most Popular Radiators for 2003 Mercury Grand Marquis

Enhance your 2003 Mercury Grand Marquis with one of the 3 Radiators we have in stock, starting at just $129.99.

Carquest Premium – Radiator (Part No.432670)

Radiator

from

$179.99
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:
  • 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
See More

Carquest Premium – Radiator (Part No.431393)

Radiator

from

$177.99
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:
  • Thermal tested under real-life temperature simulations
  • High tensile strength aluminum for maximum crimp strength
  • Plastic tanks are engineered with integrated ribbing for added strength 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
See More

KAI – Radiator (Part No.RAD2157)

Radiator

from

$129.99
New Platinum Pro Radiator, 4.6 Liter Engine, 27 1/2 Inch Core

Product Features:
  • 4.6 Liter Engine, 27 1/2 Inch Core, Made Of Plastic and Aluminum
  • Meets All Federal Motor Safety Standards
  • No Drilling Needed For Installation
  • No Modifications Needed For Installation
  • Direct Fit Replacement For Your Vehicle
  • Same Form Fit And Function As OE
  • Radiator Cap Not Included
  • Check Out The Large Selection Of Parts Available For Your Vehicle
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Best-Selling 2003 Mercury Grand Marquis Radiator Cap

Upgrade your Grand Marquis with our best-selling Radiator Cap.

Motorcraft – RADIATOR CAP (Part No.RS-527)

RADIATOR CAP

from

$10.99
RADIATOR CAP

Top-Quality Water Pumps for 2003 Mercury Grand Marquis

Choose a high-quality OEM or aftermarket Water Pump for Mercury Grand Marquis and enjoy top-notch performance from $45.99.

Carquest Premium – Engine Water Pump: New, Gasket/Seals Included (Part No.T1238)

Engine Water Pump: New, Gasket/Seals Included

from

$65.99
Carquest Premium drive motor inverter cooler water pumps are 100% new, high-quality parts that meet or exceed original equipment (O.E.) specifications. All components, including the housing, impeller, controller, gaskets, and seals are designed for long-lasting service life. These electric water pumps are supplied with the gaskets or seals necessary for installation. Our Carquest Premium auxiliary water pumps undergo stringent testing to ensure superior performance that we stand behind with an industry-leading warranty.

Product Features:
  • Built to meet or exceed OE fit, form and function
  • All components necessary for installation are supplied with pump
  • 100% tested for reliable performance
  • Follow all enclosed instructions to maximize pump life and validate warranty
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Driveworks Water Pumps – Water Pump: New, Installation Gasket Included (Part No.58-583)

Water Pump: New, Installation Gasket Included

from

$45.99
Driveworks Water Pumps offer a complete replacement part solution, with application coverage that spans from antique to present-day vehicles. All units are 100% tested and engineered to meet or exceed OEM performance, providing you a quality product you and your vehicle can rely on. All units are manufacturered with brand new components and are packaged with all gaskets required for replacement.

Product Features:
  • 100% Factory tested for leakage and dimensional precision
  • Manufactured to original casting specifications to ensure a proper fit and proper water flow for efficient cooling
  • Bearings made of heat-treated carbon or carburized steel are sealed and lubricated to ensure smooth performance throughout units life
  • Assembled with new, high-quality unitized shaft seals to prevent premature leakage
  • Supplied with gasket and other seals/gaskets as applicable per application to help complete the job
  • This pump is driven by the accessory belt and we recommend replacement if nearing service recommendation
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Motorcraft – ENGINE WATER PUMP (Part No.PW-464)

ENGINE WATER PUMP

from

$117.99
ENGINE WATER PUMP

Top Picks for 2003 Mercury Grand Marquis Thermostats

Invest in one of our 7 durable Thermostats for your 2003 Ford, knowing you’re getting trusted brands and expert craftsmanship.

Carquest Premium – High Flow Thermostat: 170 Degrees (Part No.13967)

High Flow Thermostat: 170 Degrees

from

$14.29
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. With the enlarged Orpheus opening, this high flowing thermostat will allow for more gallons per second to flow. This will allow for the engine to cool down at a faster rate compared to the OE to allow for quick and precise cooling for your engine. 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:
  • Larger opening for increased coolant flow
  • Increased strength and durability
  • High grade stainless steel and copper construction
  • Meets or exceeds OEM standards
  • Consistent and precise response to cooling system needs
  • 100% tested and calibrated
See More

Carquest Premium – Standard Thermostat: 180 Degrees (Part No.13778)

Standard Thermostat: 180 Degrees

from

$15.79
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:
  • 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
See More

Motorad UltraStats – Thermostat: 180 Degrees (Part No.5228-180JV)

Thermostat: 180 Degrees

from

$18.29
This premium upgraded thermostat is everything you were looking for. UltraStat Thermostats are the toughest thermostats on the market. All heavy gauge stainless steel construction provides long-life durability, as well as complete corrosion resistance. Exclusive BLVT Valve technology minimizes thermal shock to cooling system components. This is the perfect upgrade to help insure your cooling system is working exactly as you need and expect it to for longevity.

Product Features:
  • Heavy gauge stainless steel components offer increased reliability and long-lasting durability
  • Exclusive BLVT Valve Technology minimizes thermal shock to cooling system components
  • Stainless steel thermal element for unmatched corrosion resistance and revolutionary REAX wax mixture provides quicker reaction time
  • AccuSpring Design for stable temperature control and increased cabin comfort
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Carquest Premium – High Flow Thermostat: 180 Degrees (Part No.13968)

High Flow Thermostat: 180 Degrees

from

$12.49
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. With the enlarged Orpheus opening, this high flowing thermostat will allow for more gallons per second to flow. This will allow for the engine to cool down at a faster rate compared to the OE to allow for quick and precise cooling for your engine. 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:
  • Larger opening for increased coolant flow
  • Increased strength and durability
  • High grade stainless steel and copper construction
  • Meets or exceeds OEM standards
  • Consistent and precise response to cooling system needs
  • 100% tested and calibrated
See More

Carquest Premium – Standard Thermostat: 195 Degrees (Part No.14989)

Standard Thermostat: 195 Degrees

from

$15.99
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:
  • 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
See More

Carquest Premium Stats – High Flow Thermostat: 180 Degrees (Part No.45778)

High Flow Thermostat: 180 Degrees

from

$15.79
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. With the enlarged Orpheus opening, this high flowing thermostat will allow for more gallons per second to flow. This will allow for the engine to cool down at a faster rate compared to the OE to allow for quick and precise cooling for your engine. 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:
  • 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
See More

Motorad UltraStats – Thermostat: 195 Degrees (Part No.5228-195JV)

Thermostat: 195 Degrees

from

$18.49
This premium upgraded thermostat is everything you were looking for. UltraStat Thermostats are the toughest thermostats on the market. All heavy gauge stainless steel construction provides long-life durability, as well as complete corrosion resistance. Exclusive BLVT Valve technology minimizes thermal shock to cooling system components. This is the perfect upgrade to help insure your cooling system is working exactly as you need and expect it to for longevity.

Product Features:
  • Heavy gauge stainless steel components offer increased reliability and long-lasting durability
  • Exclusive BLVT Valve Technology minimizes thermal shock to cooling system components
  • Stainless steel thermal element for unmatched corrosion resistance and revolutionary REAX wax mixture provides quicker reaction time
  • AccuSpring Design for stable temperature control and increased cabin comfort
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Our Top-Rated Thermostat and Water Outlet Assemblies for 2003 Mercury Grand Marquis

Make a smart move for your 2003 Mercury Grand Marquis with our Thermostat and Water Outlet Assembly for $28.99.

Motorad – Thermostat Kit: Includes Housing, Thermostat and Seal, 195 Degrees (Part No.5617KT)

Thermostat Kit: Includes Housing, Thermostat and Seal, 195 Degrees

from

$28.99
Kit includes thermostat, housing, and all necessary seals/gaskets to do the complete job. These individual parts are manufactured with OEM quality materials and safety standards by an OE Supplier. This thermostat and 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. Offset design, air relief valve, and OEM style seals included where applicable.

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
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Top-Rated Engine Cooling Part Brands For Your 2003 Mercury Grand Marquis

When it comes to finding the perfect Engine Cooling Part for your 2003 Mercury Grand Marquis, Advance Auto Parts has you covered with a wide selection of high-quality OEM and aftermarket options from 15 trusted brands. We carry the most popular Engine Cooling Part brands including FELPRO, Carquest Premium, and Dorman, and more, all known for their exceptional customer ratings (average brand rating of 4.6 stars) and competitive prices, as low as $6.79. Purchasing a Engine Cooling Part from us here at Advance Auto Parts is a smart move for both you and your 2003 Mercury Grand Marquis, providing peace of mind with parts that meet or exceed OEM standards.

Popular FELPRO 2003 Mercury Grand Marquis Engine Cooling Parts

If you’re looking for a top-quality Engine Cooling Part for your 2003 Mercury Grand Marquis, Advance Auto Parts has exactly what you need with our selection of FELPRO Engine Cooling Parts. We have 3 FELPRO Engine Cooling Parts in stock for this fitment, all known for their durability and precision fit. With prices starting at just $6.79 and an average cost of $7.86, you’ll find the perfect Engine Cooling Part for your needs and budget. FELPRO Engine Cooling Parts for the 2003 Mercury Grand Marquis come highly rated, with over 122 customer reviews and an impressive average rating of 4.6 stars. Choosing a FELPRO Engine Cooling Part from Advance Auto Parts is a smart move to ensure quality and value for your vehicle.
Engine Water Pump Gasket
from $6.79
(11)
Engine Water Pump Gasket
“Perfect fit !”
Engine Water Pump Bypass Pipe O-Ring Kit
from $6.79
(1)
Engine Water Pump Bypass Pipe O-Ring Kit
“It was just what I needed”
Multi-Purpose O-Ring
from $9.99
(110)
Multi-Purpose O-Ring
“Perfect for my 2006 F-250 5.4 engine”

Top-Quality Carquest Premium 2003 Mercury Grand Marquis Engine Cooling Parts

For those in search of a high-quality Engine Cooling Part for their 2003 Mercury Grand Marquis, Advance Auto Parts offers a great selection of Carquest Premium Engine Cooling Parts. With 3 Carquest Premium 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 $14.29, with an average price of $32.02, giving you a range of options to suit your budget. Backed by over 58 customer ratings and an average rating of 4.4 stars, Carquest Premium Engine Cooling Parts provide both reliability and excellent performance. Choosing a Carquest Premium Engine Cooling Part from Advance Auto Parts is a smart investment in your vehicle’s performance and longevity.
High Flow Thermostat: 170 Degrees
from $14.29
(16)
High Flow Thermostat: 170 Degrees
“Great fit . Works properly so far so good”
Engine Water Pump: New, Gasket/Seals Included
from $65.99
(26)
Engine Water Pump: New, Gasket/Seals Included
“Works fine in my 2005 Crown Victoria LX Sport. Was a pain to get the old one out.”
Standard Thermostat: 180 Degrees
from $15.79
(16)
Standard Thermostat: 180 Degrees
“Car did not run hot, but lower radiator hose started leaking and was too hot to touch. Replaced and lower radiator hose temp was much cooler. Car runs”

FAQs for 2003 Mercury Grand Marquis Engine Cooling Parts

What are the best-selling Engine Cooling Parts for 2003 Mercury Grand Marquis?

Out of 50 Engine Cooling Parts that fit 2003 Mercury Grand Marquis, the following parts are the top sellers:

What’s the price range for 2003 Mercury Grand Marquis Engine Cooling Parts?

The prices of Engine Cooling Parts for the 2003 Mercury Grand Marquis range from $0.99 up to $519.99 for the most premium parts.

What is the average price of an Engine Cooling Parts Engine Cooling Part for a 2003 Mercury Grand Marquis?

The average price for Engine Cooling Parts for the 2003 Mercury Grand Marquis is $49.02. 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 Mercury Grand Marquis model years?

Yes, we carry Engine Cooling Parts for 35 model years of Mercury Grand Marquis between 1975 and 2011. The following model years are the most popular for Engine Cooling Part purchases: 2011, 2010, 2009, 2008, 2007, 2006, 2005, 2004, and 2002.

What are the cheapest Engine Cooling Parts for my 2003 Mercury Grand Marquis?

The cheapest 2003 Mercury Grand Marquis Engine Cooling Parts we carry are:

Does Advance Auto Parts sell Engine Cooling Parts for any other 2003 Mercury models?

Yes. We stock Engine Cooling Parts for 1 other popular 2003 Mercury models. Some of the most popular are 2003 Marauder Engine Cooling Parts and 2003 Mountaineer Engine Cooling Parts.

What are the top-rated Engine Cooling Parts that fit the 2003 Mercury Grand Marquis?

The one 2003 Mercury Grand Marquis Engine Cooling Part we have in stock is the Panel Trim Retainer – Interior – Ford (Sold by each). It costs $0.99.

What types of Engine Cooling Parts do you sell for my 2003 Mercury Grand Marquis?

As of 4/10/25, these are some of the most in-demand types of Engine Cooling Parts for a 2003 Mercury Grand Marquis:

Can I get help with 2003 Mercury Grand Marquis 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 Mercury Engine Cooling Parts and more.

What is your return policy for Mercury Grand Marquis Engine Cooling Parts?

Advance Auto Parts keeps returns simple. For new Mercury Grand Marquis Engine Cooling Parts and accessories, your online orders can be returned, in their original condition, within 45 days. For requirements, see the returns page.