2004 Audi A6 Quattro Engine Cooling Parts

Keep Your 2004 Audi A6 Quattro 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 2004 Audi A6 Quattro looking sharp and performing at its best. At Advance Auto Parts we carry a wide selection of dependable options, including Radiator Fan Clutch, Thermostat and Water Outlet Assemblies, and Coolant Reservoir Caps. 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 and Mahle. For example, Carquest Premium Engine Cooling Parts start at just $13.99 with an average 4.4 star rating. Mahle offer similar pricing and quality, backed by strong customer feedback. With over 27 reviews and a solid 3 star average, you can shop with confidence knowing other Audi A6 Quattro 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 2004 Audi A6 Quattro in peak condition, inside and out.

Essential 2004 Audi A6 Quattro Engine Cooling Parts

MAHLE Original – Engine Coolant Thermostat Housing Gasket (Part No.C31633)

Engine Coolant Thermostat Housing Gasket

from

$2.49
MAHLE® gaskets provide world class sealing products trusted by OEMs & Technicians around the globe.

Product Features:
  • All MAHLE gaskets meet or exceed the original equipment specifications providing the finest sealing products available
  • MAHLE gaskets utilizes OE equivalent or better materials in all our gaskets
  • MAHLE gaskets is the leader in Domestic, Asian and European applications
  • The contents of MAHLE gaskets are packaged in shrink wrapped tray, giving you the added security of knowing that you have the right parts, prior to opening the package
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Victor Reinz – Engine Coolant Thermostat Housing Gasket (Part No.71-39052-00)

Engine Coolant Thermostat Housing Gasket

from

$29.99
With Victor Reinz gaskets, you can be sure you are getting sealing solutions that deliver OE quality gasket technology and engineering. That is because Victor Reinz is an original equipment supplier and the trusted choice of manufacturers the world over, offering broad coverage for foreign and domestic cars and trucks. In Victor Reinz gasket sets, you get the right combination of components needed for fast, long-lasting repairs.

Product Features:
  • Choosing Victor Reinz assures getting OE quality parts in gaskets sets that have the coverage, contents, packaging and electronic cataloging to best meet the needs of the aftermarket.
See More

Felpro – Multi-Purpose O-Ring (Part No.35763)

Multi-Purpose O-Ring

from

$4.49
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
  • 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
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Motorad – Integrated Thermostat Housing: With Sensor, With Seal, 221 Degrees (Part No.941-221)

Integrated Thermostat Housing: With Sensor, With Seal, 221 Degrees

from

$87.99
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

Rein – OE Quality Thermostat Assembly (Part No.CTA0013)

OE Quality Thermostat Assembly

from

$44.99
Rein Automotive® OE quality thermostat assemblies install, fit and perform the way the original manufacturer intended. These assemblies are designed to meet or exceed the OE materials used. Rein thermostat housings are constructed of metal or plastic based on vehicle specific factory requirements. The housings are constructed from molds cast directly from the OEM parts to meet the strict tolerances of the vehicle’s factory specifications. This ensures a smooth and easy installation, just as one would expect to find with OE quality. Rein thermostats are produced with high-quality metals and components to ensure proper durability and service life. The thermostats are temperature calibrated to have a consistent and precise response suiting cooling system needs. Our quality thermostat assemblies aim to provide the profession repair technician and vehicle owner the peace of mind and trust that is expected from an OE quality component.

Product Features:
  • Matches original equipment design specifications
  • Direct fitments allows easy installation
  • Manufactured to strict engineering standards/specifications in materials and tolerances
  • Thermostat set to 92 degrees Celsius to maintain optimal running temperature
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Carquest Premium – Engine Electric Water Pump: New, Plastic Housing (Part No.T1645)

Engine Electric Water Pump: New, Plastic Housing

from

$142.99
Carquest Premium auxiliary 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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Rein – Auxiliary Water Pump (Part No.WPA0033)

Auxiliary Water Pump

from

$151.99
Rein Automotive OE quality auxiliary water pumps are fabricated from original casting specifications to ensure proper fit for easy installation, proper water flow and maximum cooling. Auxiliary water pump use high-quality plastic or metal construction to ensure durability and long service life. Our auxiliary water pumps aim to provide the professional repair technician and vehicle owner the peace of mind and trust that is expected from an OE quality component.

Product Features:
  • High-quality plastic or metal construction
  • Flow-rates matched to OE flow-rates
  • Includes the vibration isolators, mounting brackets and hardware where applicable for easy installation
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Carquest Premium – Standard Reservoir Cap: 20 PSI (Part No.10249)

Standard Reservoir Cap: 20 PSI

from

$13.99
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:
  • Maintains proper cooling system pressure
  • Easy installation and removal
  • 100% tested to ensure proper pressure and longevity
  • Meets all OEM specifications
See More

Rein – Cap-Expansion Tank (Part No.CPE0047)

Cap-Expansion Tank

from

$19.99
Rein Automotive OE Quality expansion tank caps are designed to be direct replacements for OE caps. Rein caps are designed to match or exceed the OE materials used and are produced to the highest standards to ensure long service life. Rein Automotive OE quality expansion tank caps keep the coolant system at the proper pressure just like the OE cap.

Product Features:
  • Manufactured to strict engineering standards/specifications in materials and tolerances.
  • Direct fit
  • Meets or exceeds pressure specifications demanded by the OE manufacturer.
  • Produced by an original equipment supplier.
See More

Victor Reinz – Engine Coolant Pipe O-Ring (Part No.41-10479-00)

Engine Coolant Pipe O-Ring

from

$5.99
With Victor Reinz gaskets, you can be sure you are getting sealing solutions that deliver OE quality gasket technology and engineering. That is because Victor Reinz is an original equipment supplier and the trusted choice of manufacturers the world over, offering broad coverage for foreign and domestic cars and trucks. In Victor Reinz gasket sets, you get the right combination of components needed for fast, long-lasting repairs.

Product Features:
  • Choosing Victor Reinz assures getting OE quality parts in gaskets sets that have the coverage, contents, packaging and electronic cataloging to best meet the needs of the aftermarket.
See More

Victor Reinz – Engine Coolant Thermostat Seal (Part No.41-76367-00)

Engine Coolant Thermostat Seal

from

$4.99
With Victor Reinz gaskets, you can be sure you are getting sealing solutions that deliver OE quality gasket technology and engineering. That is because Victor Reinz is an original equipment supplier and the trusted choice of manufacturers the world over, offering broad coverage for foreign and domestic cars and trucks. In Victor Reinz gasket sets, you get the right combination of components needed for fast, long-lasting repairs.

Product Features:
  • Choosing Victor Reinz assures getting OE quality parts in gaskets sets that have the coverage, contents, packaging and electronic cataloging to best meet the needs of the aftermarket.
See More

Victor Reinz – Engine Coolant Thermostat Housing Seal (Part No.41-76137-00)

Engine Coolant Thermostat Housing Seal

from

$7.99
With Victor Reinz gaskets, you can be sure you are getting sealing solutions that deliver OE quality gasket technology and engineering. That is because Victor Reinz is an original equipment supplier and the trusted choice of manufacturers the world over, offering broad coverage for foreign and domestic cars and trucks. In Victor Reinz gasket sets, you get the right combination of components needed for fast, long-lasting repairs.

Product Features:
  • Choosing Victor Reinz assures getting OE quality parts in gaskets sets that have the coverage, contents, packaging and electronic cataloging to best meet the needs of the aftermarket.
See More

Felpro – Engine Coolant Thermostat Housing Seal (Part No.35924)

Engine Coolant Thermostat Housing Seal

from

$3.99
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 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
See More

Rein – Thermostat Insert 95C (Part No.CTI0010)

Thermostat Insert 95C

from

$34.99
Rein Automotive OE quality thermostat inserts install, fit and perform the way the original manufacturer intended. This ensures a smooth and easy installation, just as one would expect to find with OE quality. These inserts are designed to meet or exceed the OE materials used. Rein thermostats are produced with high-quality metals and components to ensure proper durability and service life. The thermostats are temperature calibrated to have a consistent and precise response suiting cooling system needs. Our quality thermostat inserts aim to provide the profession repair technician and vehicle owner peace of mind and trust that is expected from an OE quality component.

Product Features:
  • Matches original equipment design specifications
  • All gaskets or seals necessary for installation are supplied with thermostats
  • Manufactured to strict engineering standards/specifications in materials and tolerances
  • Thermostat set to 95 degrees Celsius to maintain optimal running temperature
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Motorad – Standard Thermostat: 180 Degrees (Part No.304-180)

Standard Thermostat: 180 Degrees

from

$25.99
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:
  • 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 – Standard Thermostat: With Seal, 203 Degrees (Part No.708-203)

Standard Thermostat: With Seal, 203 Degrees

from

$79.99
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:
  • 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 – Radiator: With Transmission Oil Cooler (Part No.432554)

Radiator: With Transmission Oil Cooler

from

$216.99
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 – Radiator: With Transmission Oil Cooler (Part No.812828)

Radiator: With Transmission Oil Cooler

from

$269.99
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: With Transmission Oil Cooler (Part No.812912)

Radiator: With Transmission Oil Cooler

from

$374.99
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
  • Oil cooler designs meet or exceed OE standards, keeping the vehicle’s engine and transmission performing at optimal conditions
  • OEM grade, premium fittings for transmission or engine oil coolers (where applicable)
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Carquest Premium – Engine Cooling Fan Switch (Part No.ACA1571)

Engine Cooling Fan Switch

from

$32.99
Carquest Premium Vehicle Solutions provides high-quality solutions for a wide range of applications. The Engine Cooling Fan Switch regulates the operation of the cooling fan based on engine temperature, preventing overheating and ensuring optimal engine performance by maintaining a safe operating temperature. Engineered for maximum performance and durability, our products are built to excel in even the most demanding conditions, ensuring reliable operation and long-lasting value.

Product Features:
  • Durable Construction: Designed with high-quality materials to withstand harsh environmental conditions, ensuring long-lasting performance in extreme temperatures, vibrations, and moisture exposure.
  • Precision Engineering: Accurate sensing and switching capabilities provide reliable performance, reducing the risk of malfunctions and improving vehicle safety and efficiency.
  • Easy Installation & Maintenance: Designed for quick installation and minimal upkeep, reducing downtime and repair costs for both manufacturers and consumers.
  • Fit/Form/Function: Each vehicle electronic component is engineered to meet or surpass OEM standards, ensuring precise fit, optimal functionality, and reliable performance.
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Carquest Premium – Engine Cooling Fan Switch (Part No.TFA1033)

Engine Cooling Fan Switch

from

$62.99
Carquest Premium Vehicle Solutions provides high-quality solutions for a wide range of applications. The Engine Cooling Fan Switch regulates the operation of the cooling fan based on engine temperature, preventing overheating and ensuring optimal engine performance by maintaining a safe operating temperature. Engineered for maximum performance and durability, our products are built to excel in even the most demanding conditions, ensuring reliable operation and long-lasting value.

Product Features:
  • Durable Construction: Designed with high-quality materials to withstand harsh environmental conditions, ensuring long-lasting performance in extreme temperatures, vibrations, and moisture exposure.
  • Precision Engineering: Accurate sensing and switching capabilities provide reliable performance, reducing the risk of malfunctions and improving vehicle safety and efficiency.
  • Easy Installation & Maintenance: Designed for quick installation and minimal upkeep, reducing downtime and repair costs for both manufacturers and consumers.
  • Fit/Form/Function: Each vehicle electronic component is engineered to meet or surpass OEM standards, ensuring precise fit, optimal functionality, and reliable performance.
See More

URO Parts – Auxiliary Fan Switch (Part No.8D0959481B)

Auxiliary Fan Switch

from

$12.99
URO Parts has been a leading brand of replacement auto parts for European vehicles for more than thirty years. Affordable yet dedicated to quality, URO Parts controls its production process in strict accordance with ISO/TS 16949 QMS specifications and offers a wide variety of components used to restore or repair engine, electrical, drive train, braking, steering, suspension, climate control, cooling, exhaust, and fuel systems in classic to late-model German, British, and Scandinavian vehicles. Looking for parts that are even higher quality than original equipment? URO Parts engineers analyze common failures and identify weaknesses in original equipment parts when creating URO Premium components, which are superior to OE in performance and reliability thanks to improved materials and more robust designs. Thanks to high-quality, competitively-priced URO Parts and bulletproof URO Premium replacement components, owning a prestigious European vehicle is no longer an expensive luxury reserved for the elite and wealthy.

Product Features:
  • Guaranteed fitment
  • Direct-fit OE replacement design restores factory cooling fan switch function
  • Easy plug-and-play connection
  • Manufactured using high-quality materials to withstand intense engine compartment and cooling system heat
  • Alloy conductors minimize electrical resistance for accurate operation
  • Designed and tested for reliability and long life
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Carquest Premium – Universal Fan Clutch – 5" Thermal Import/Compact (Part No.215069)

Universal Fan Clutch - 5" Thermal Import/Compact

from

$175.99
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 – Engine Coolant Temperature Sensor (Part No.WTA1027)

Engine Coolant Temperature Sensor

from

$24.99
Carquest Premium coolant temperature sensors and switches are designed to perform in harsh engine environments and meet or exceed original equipment (O.E.) specifications. Built by manufacturers that meet IATF 16949 certified framework, an internationally recognized proof of quality in the automotive industry, Carquest Premium coolant temperature sensors and switches undergo extensive validation testing to ensure long-lasting performance and reliability. Carquest Premium coolant temperature sensors and switches are part of our Carquest Vehicle Solutions, which is a full line of engine management and electronics products that help control ignition, fuel delivery and emission systems. Carquest Vehicle Solutions are OE-quality parts designed, engineered and tested by world-class manufacturers to ensure a reliable and long-lasting repair.

Product Features:
  • Designed to meet or exceed OE specifications for fit, form and function
  • 100% factory resistance calibrated to ensure extremely accurate temperature readings for optimal performance
  • O-rings, seals or thread sealant are included if required
  • Wires, clips and probe length match OE (where applicable)
  • 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
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NTK – Engine Coolant Temperature Sensor (Part No.EF0079)

Engine Coolant Temperature Sensor

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.

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
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Carquest – Engine Coolant Temperature Sensor (Part No.WT7257)

Engine Coolant Temperature Sensor

from

$20.99
High-quality products that meet OE appearance and performance to provide professional technicians and DIYers with a cost-effective solution.

Product Features:
  • Designed to OE standards for ease of installation
  • In manufacturing, we custom form the wax pellets for different temperature range specifications. All units are calibrated & tested to confirm switch actuation at their specified temperature
  • The switch is designed using a formed bimetallic contact arm. The bimetal contact movement is achieved using the different expansion rates of two metals fused together. This is a creep action device, provides precise performance
  • In production, all thermal switches are factory-calibrated to make electrical contact at the specified lower-temperature set point
  • Robust design and high grade materials meet the stringent demands of today’s service professional
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Rein – Temperature Sensor Kit (Part No.ELC0051P)

Temperature Sensor Kit

from

$20.99
Electrical parts control all aspects of vehicles on the road today. Replacing these components when they are starting to fail will ensure your vehicle has maximum performance and fuel economy. This is why Rein Automotive electrical parts are application specific and match the design and function of the OE parts.

Product Features:
  • Tested to ensure maximum performance
  • Manufactured to strict engineering standards/specifications in materials and tolerances
  • Long life and durability
  • Made by the OE manufacturer
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Carquest Premium – Coolant Temperature Sensor 1TS1043 (Part No.WTC1143)

Coolant Temperature Sensor 1TS1043

from

$24.99
Product Features:
  • 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
See More

Most Popular Radiator Fan Clutch for 2004 Audi A6 Quattros

Enhance your 2004 Audi A6 Quattro with this popular Radiator Fan Clutch we have in stock, for $175.99.

Carquest Premium – Universal Fan Clutch – 5" Thermal Import/Compact (Part No.215069)

Universal Fan Clutch - 5" Thermal Import/Compact

from

$175.99
Product Features:
  • Designed, tested, and built by application
  • OE performance, fit, and appearance
  • Precision machined
  • Out of box installation
See More

Best-Selling 2004 Audi A6 Quattro Thermostat and Water Outlet Assemblies

Upgrade your A6 Quattro with one of our 3 best-selling Thermostat and Water Outlet Assemblies.

Motorad – Integrated Thermostat Housing: With Seal, 198 Degrees (Part No.914-198)

Integrated Thermostat Housing: With Seal, 198 Degrees

from

$67.99
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:
  • 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

Dorman – Thermostat Assembly: Includes Housing, O-Ring, and Thermostat, 198 Degrees (Part No.902-5167)

Thermostat Assembly: Includes Housing, O-Ring, and Thermostat, 198 Degrees

from

$59.99
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:
  • 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
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Rein – OE Quality Thermostat Assembly (Part No.CTA0013)

OE Quality Thermostat Assembly

from

$44.99
Rein Automotive® OE quality thermostat assemblies install, fit and perform the way the original manufacturer intended. These assemblies are designed to meet or exceed the OE materials used. Rein thermostat housings are constructed of metal or plastic based on vehicle specific factory requirements. The housings are constructed from molds cast directly from the OEM parts to meet the strict tolerances of the vehicle’s factory specifications. This ensures a smooth and easy installation, just as one would expect to find with OE quality. Rein thermostats are produced with high-quality metals and components to ensure proper durability and service life. The thermostats are temperature calibrated to have a consistent and precise response suiting cooling system needs. Our quality thermostat assemblies aim to provide the profession repair technician and vehicle owner the peace of mind and trust that is expected from an OE quality component.

Product Features:
  • Matches original equipment design specifications
  • Direct fitments allows easy installation
  • Manufactured to strict engineering standards/specifications in materials and tolerances
  • Thermostat set to 92 degrees Celsius to maintain optimal running temperature
See More

Top-Quality Coolant Reservoir Caps for 2004 Audi A6 Quattros

Choose a high-quality OEM or aftermarket Coolant Reservoir Cap for Audi A6 Quattros and enjoy top-notch performance from $13.99.

Carquest Premium – Standard Reservoir Cap: 20 PSI (Part No.10249)

Standard Reservoir Cap: 20 PSI

from

$13.99
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:
  • Maintains proper cooling system pressure
  • Easy installation and removal
  • 100% tested to ensure proper pressure and longevity
  • Meets all OEM specifications
See More

Rein – Cap-Expansion Tank (Part No.CPE0047)

Cap-Expansion Tank

from

$19.99
Rein Automotive OE Quality expansion tank caps are designed to be direct replacements for OE caps. Rein caps are designed to match or exceed the OE materials used and are produced to the highest standards to ensure long service life. Rein Automotive OE quality expansion tank caps keep the coolant system at the proper pressure just like the OE cap.

Product Features:
  • Manufactured to strict engineering standards/specifications in materials and tolerances.
  • Direct fit
  • Meets or exceeds pressure specifications demanded by the OE manufacturer.
  • Produced by an original equipment supplier.
See More

Dorman – Help – Coolant Reservoir Cap (Part No.54016)

Coolant Reservoir Cap

from

$13.99
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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Top Picks for 2004 Audi A6 Quattro Thermostats

Invest in one of our 5 durable Thermostats for your 2004 Audi, knowing you’re getting trusted brands and expert craftsmanship.

Motorad – Standard Thermostat: 180 Degrees (Part No.304-180)

Standard Thermostat: 180 Degrees

from

$25.99
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:
  • 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 – Standard Thermostat: 198 Degrees (Part No.14099)

Standard Thermostat: 198 Degrees

from

$17.99
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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Motorad – Standard Thermostat: 170 Degrees (Part No.304-170)

Standard Thermostat: 170 Degrees

from

$22.99
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:
  • 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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Motorad – Standard Thermostat: With Thermostat Insert, 198 Degrees (Part No.466-198)

Standard Thermostat: With Thermostat Insert, 198 Degrees

from

$65.99
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:
  • 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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Carquest Premium – Thermostat (Part No.48049)

Thermostat

from

$32.49
Original equipment design provides exact fit and performance.

Product Features:
  • Precise fitting sealing edges prevent leakage and premature cooling.
  • Self-cleaning and self-aligning thermostat valve.
  • Stainless steel assembly and springs are engineered for long life and smooth performance.
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Top-Rated Radiators for 2004 Audi A6 Quattros

Make a smart move for your 2004 Audi A6 Quattro with products all priced from $216.99 to $327.99.

Carquest Premium – Radiator: With Transmission Oil Cooler (Part No.432554)

Radiator: With Transmission Oil Cooler

from

$216.99
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 – Radiator (Part No.812974)

Radiator

from

$296.99
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
  • Oil cooler designs meet or exceed OE standards, keeping the vehicle’s engine and transmission performing at optimal conditions
  • OEM grade, premium fittings for transmission or engine oil coolers (where applicable)
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Carquest Premium – Radiator: With Transmission Oil Cooler (Part No.433659)

Radiator: With Transmission Oil Cooler

from

$311.99
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: With Transmission Oil Cooler (Part No.812639)

Radiator: With Transmission Oil Cooler

from

$327.99
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

Top-Rated Engine Cooling Part Brands For Your 2004 Audi A6 Quattro

When it comes to finding the perfect Engine Cooling Part for your 2004 Audi A6 Quattro, 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 and Mahle, and more, all known for their exceptional customer ratings (average brand rating of 4.4 stars) and competitive prices, as low as $2.49. Purchasing a Engine Cooling Part from us here at Advance Auto Parts is a smart move for both you and your 2004 Audi A6 Quattro, providing peace of mind with parts that meet or exceed OEM standards.

Popular Carquest Premium 2004 Audi A6 Quattro Engine Cooling Parts

If you’re looking for a top-quality Engine Cooling Part for your 2004 Audi A6 Quattro, 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 $13.99 and an average cost of $115.49, you’ll find the perfect Engine Cooling Part for your needs and budget. Carquest Premium Engine Cooling Parts for the 2004 Audi A6 Quattro come highly rated, with over 10 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.
Standard Reservoir Cap: 20 PSI
from $13.99
(3)
Standard Reservoir Cap: 20 PSI
“Great price”
Radiator: With Transmission Oil Cooler
from $216.99
(7)
Radiator: With Transmission Oil Cooler
“Perfect fit for my B5.5 Passat 2.8L 5spd manual trans even tho it’s for an auto car.”

Top-Quality Mahle 2004 Audi A6 Quattro Engine Cooling Parts

For those in search of a high-quality Engine Cooling Part for their 2004 Audi A6 Quattro, Advance Auto Parts offers a great selection of Mahle Engine Cooling Parts. With 1 Mahle 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 $2.49, giving you a range of options to suit your budget. Backed by over 1 customer ratings and an average rating of 4.4 stars, Mahle Engine Cooling Parts provide both reliability and excellent performance. Choosing a Mahle Engine Cooling Part from Advance Auto Parts is a smart investment in your vehicle’s performance and longevity.
Engine Coolant Thermostat Housing Gasket
from $2.49
(1)
Engine Coolant Thermostat Housing Gasket
“So far so good”

FAQs for 2004 Audi A6 Quattro Engine Cooling Parts

What are the best-selling Engine Cooling Parts for 2004 Audi A6 Quattros?

Out of 30 Engine Cooling Parts that fit 2004 Audi A6 Quattros, the following parts are the top sellers:

What’s the price range for 2004 Audi A6 Quattro Engine Cooling Parts?

The prices of Engine Cooling Parts for the 2004 Audi A6 Quattro range from $2.49 up to $327.99 for the most premium parts.

What is the average price of an Engine Cooling Part for a 2004 Audi A6 Quattro?

The average price for Engine Cooling Parts for the 2004 Audi A6 Quattro is $59.65. 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 Audi A6 Quattro model years?

Yes, we carry Engine Cooling Parts for 29 model years of Audi A6 Quattros between 1995 and 2025. The following model years are the most popular for Engine Cooling Part purchases: 2022, 2021, 2020, 2019, 2018, 2017, 2016, 2015, and 2014.

What are the cheapest Engine Cooling Parts for my 2004 Audi A6 Quattro?

The cheapest 2004 Audi A6 Quattro Engine Cooling Parts we carry are:

Does Advance Auto Parts sell Engine Cooling Parts for any other 2004 Audi models?

Yes. We stock Engine Cooling Parts for 7 other popular 2004 Audi models. Some of the most popular are 2004 S4 Engine Cooling Parts, 2004 A4 Quattro Engine Cooling Parts, 2004 A4 Engine Cooling Parts, 2004 A6 Engine Cooling Parts, and 2004 TT Quattro Engine Cooling Parts.

What are the top-rated Engine Cooling Parts that fit the 2004 Audi A6 Quattro?

The one 2004 Audi A6 Quattro Engine Cooling Part we have in stock is the Engine Coolant Thermostat Housing Gasket. It is rated 5 stars and costs $2.49.

What types of Engine Cooling Parts do you sell for my 2004 Audi A6 Quattro?

As of 11/2/25, these are some of the most in-demand types of Engine Cooling Parts for a 2004 Audi A6 Quattro:

Can I get help with 2004 Audi A6 Quattro 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 Audi Engine Cooling Parts and more.

What is your return policy for Audi A6 Quattro Engine Cooling Parts?

Advance Auto Parts keeps returns simple. For new Audi A6 Quattro Engine Cooling Parts and accessories, your online orders can be returned, in their original condition, within 45 days. For requirements, see the returns page.