2004 Audi A4 Engine Cooling Parts

Keep Your 2004 Audi A4 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 A4 looking sharp and performing at its best. At Advance Auto Parts we carry a wide selection of dependable options, including Coolant Reservoir Caps, Radiators, and Thermostat and Water Outlet Assemblies. 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 Dorman, Carquest Premium, and Beck/Arnley. For example, Dorman Engine Cooling Parts start at just $50.99 with an average 4.2 star rating. Carquest Premium and Beck/Arnley offer similar pricing and quality, backed by strong customer feedback. With over 69 reviews and a solid 4 star average, you can shop with confidence knowing other Audi A4 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 Air Conditioning Parts and Blower Motor and Related Products. At Advance Auto Parts, we’re here to help you keep your 2004 Audi A4 in peak condition, inside and out.

Essential 2004 Audi A4 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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Carquest Premium – Thermostat Kit: Gasket Included (Part No.85960)

Thermostat Kit: Gasket Included

from

$151.99
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))
  • 100% virgin resin material to insure durability
  • 100% leak tested
  • Direct-fit replacement for ease of installation
  • Includes quality thermostat
  • Meets and/or exceeds OEM standard
  • Includes quality gasket or O-ring to ensure proper seal (where applicable)
  • 100% virgin resin material to insure durability
  • 100% leak tested
  • Direct-fit replacement for ease of installation
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Felpro – Multi-Purpose O-Ring (Part No.35675)

Multi-Purpose O-Ring

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
  • 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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Dorman – Radiator Fan Control Module (Part No.902-436)

Radiator Fan Control Module

from

$287.99
This engine cooling fan module is designed to match the fit and function of the original module on specified applications. Made of quality materials, it is engineered for reliable performance and durability.

Product Features:
  • Direct replacement – this engine cooling fan module is designed to match the fit and function of the original module on specified applications
  • Ideal solution – this module is a reliable replacement for an original part that has failed due to fatigue or electrical malfunction
  • Durable construction – this part is made from quality materials to ensure reliable performance and a long service life
  • Trustworthy quality – designed in the United States and backed by more than a century of automotive aftermarket excellence
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Rein – Expansion Tank (Part No.EPT0153)

Expansion Tank

from

$40.99
Rein Automotive OE quality expansion tanks, install, fit and perform the way the original manufacturer intended. These tanks are designed to match or exceed the OE materials used and are produced from virgin plastic with no regrind to prevent cracking from heat cycles and ensure the plastic is durable and will have a long service life.

Product Features:
  • Produced from virgin plastic meeting/exceeding OE specifications and ensuring long life
  • Resistant to cracking and wear from heat cycles preventing coolant loss
  • Direct fitment allows easy installation
  • Manufactured to strict engineering standards/specifications in materials and tolerances
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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.
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Victor Reinz – Engine Coolant Thermostat Housing Seal (Part No.41-76540-00)

Engine Coolant Thermostat Housing Seal

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 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.
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Dorman – Radiator Fan Assembly: Dual, Cost Effective and Reliable (Part No.620-839)

Radiator Fan Assembly: Dual, Cost Effective and Reliable

from

$301.99
This engine cooling fan assembly is precision-engineered to match the fit and performance of the stock radiator fan on specific vehicle years, makes and models. It has been rigorously tested to ensure it cools as effectively as the original part.

Product Features:
  • Ideal replacement – this engine cooling fan assembly was precision-engineered to match the fit and performance of the stock radiator fan assembly on specific vehicles
  • Complete package – assembly is designed with the same materials and components as the original part
  • Quality assured – motors are tested in laboratory settings to ensure performance
  • Cost effective and reliable – trustworthy manufacturing for far less than same part at the dealership
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Dorman – Radiator Fan Assembly: Dual, Cost Effective & Reliable (Part No.620-808)

Radiator Fan Assembly: Dual, Cost Effective & Reliable

from

$331.99
This engine cooling fan assembly is precision-engineered to match the fit and performance of the stock radiator fan on specific vehicle years, makes and models. It has been rigorously tested to ensure it cools as effectively as the original part.

Product Features:
  • Ideal replacement – this engine cooling fan assembly was precision-engineered to match the fit and performance of the stock radiator fan assembly on specific vehicles
  • Complete package – assembly is designed with the same materials and components as the original part
  • Quality assured – motors are tested in laboratory settings to ensure performance
  • Cost effective and reliable – trustworthy manufacturing for far less than same part at the dealership
See More

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 (Part No.813665)

Radiator

from

$285.99
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

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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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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Dorman – Thermostat Assembly: Includes Housing, Thermostat, and Gasket, 192 Degrees (Part No.902-718)

Thermostat Assembly: Includes Housing, Thermostat, and Gasket, 192 Degrees

from

$107.99
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
See More

Dorman – Thermostat Assembly: Includes Complete Housing Assembly with Sensor, 212 Degrees (Part No.902-814)

Thermostat Assembly: Includes Complete Housing Assembly with Sensor, 212 Degrees

from

$138.99
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
See More

Beck/Arnley – New Water Pump (Part No.131-2227)

New Water Pump

from

$112.99
Beck/Arnley parts meet foreign nameplate OE specifications for form, fit and function. Our product specialists work with a network of global sourcing partners so you can install the right part with confidence.

Product Features:
  • Matches OE form, fit and function
  • Heavy duty bearings, sealed and lubed for life
  • Includes all necessary gaskets and seals needed for a complete installation
  • Where applicable, metal and resin impellers are offered. See catalog to match pump to this vehicle
  • Be sure to use the proper coolant to maximize cooling system components. See Beck/Arnley catalog for the coolant for this application.
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Carquest Premium – Engine Water Pump: New, Gasket/Seals Included (Part No.T1220)

Engine Water Pump: New, Gasket/Seals Included

from

$105.99
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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Carquest Premium – Aux Water Pump (Part No.T1755)

Aux Water Pump

from

$309.99
Aux Water Pump

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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Carquest Premium – Standard Thermostat: 190 Degrees (Part No.14419)

Standard Thermostat: 190 Degrees

from

$17.29
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. 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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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

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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Victor Reinz – Engine Water Pump Gasket (Part No.71-38928-00)

Engine Water Pump Gasket

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 Water Pump Gasket (Part No.35872)

Engine Water Pump Gasket

from

$5.49
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
  • Manufactured for the sealing repair environment
  • Validated for fit, form, and function
  • Quality that you can trust
See More

KAI – Dual Fan Asm 1.8/2.0L L4 Eng (Part No.AU3115107)

Dual Fan Asm 1.8/2.0L L4 Eng

from

$225.99
New Platinum Pro Radiator And Condenser Fan Assembly, 1.8/2.0 Liter L4 Engines

Product Features:
  • 1.8 And 2.0 Liter L4 Engine
  • 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
See More

KAI – Rad/Condenser Fan Assembly (Part No.AU3115113)

Rad/Condenser Fan Assembly

from

$222.99
New Platinum Pro Radiator And Condenser Fan Assembly, 2.0/3.2 Liter V6 Models, Module Not Included

Product Features:
  • 2.0/3.2 Liter V6 Models, Module Not Included, Made Of Plastic
  • 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
See More

Most Popular Coolant Reservoir Caps for 2004 Audi A4s

Enhance your 2004 Audi A4 with one of the 2 Coolant Reservoir Caps we have in stock, starting at just $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

Best-Selling 2004 Audi A4 Radiators

Upgrade your A4 with one of our 5 best-selling Radiators, earning an average 3 stars rating across 12 reviews.

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
See More

Carquest Premium – Radiator: With Transmission Oil Cooler (Part No.433658)

Radiator: With Transmission Oil Cooler

from

$244.99
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.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

KAI – Radiator (Part No.RAD2556)

Radiator

from

$171.99
New Platinum Pro Radiator, 1.8 Liter Engine, With Transmission Oil Cooler

Product Features:
  • 1.8 Liter Engine, With Transmission Oil Cooler, 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
See More

Carquest Premium – Radiator (Part No.812557)

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

Top-Quality Thermostat and Water Outlet Assemblies for 2004 Audi A4s

Choose a high-quality OEM or aftermarket Thermostat and Water Outlet Assembly for Audi A4s and enjoy top-notch performance from $44.99.

Dorman – Thermostat Assembly: Includes Complete Housing Assembly with Sensor, 212 Degrees (Part No.902-814)

Thermostat Assembly: Includes Complete Housing Assembly with Sensor, 212 Degrees

from

$138.99
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
See More

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

Rein – Thermostat Assembly 100C (Part No.CTA0021)

Thermostat Assembly 100C

from

$129.99
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 100 degrees Celsius to maintain optimal running temperature
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
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Our Top Pick for a 2004 Audi A4 Thermostat

Invest in a durable Thermostat for your 2004 Audi, knowing you’re getting trusted brands and expert craftsmanship.

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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Top-Rated Water Pumps for 2004 Audi A4s

Make a smart move for your 2004 Audi A4 with products all priced from $74.99 to $112.99.

Beck/Arnley – New Water Pump (Part No.131-2227)

New Water Pump

from

$112.99
Beck/Arnley parts meet foreign nameplate OE specifications for form, fit and function. Our product specialists work with a network of global sourcing partners so you can install the right part with confidence.

Product Features:
  • Matches OE form, fit and function
  • Heavy duty bearings, sealed and lubed for life
  • Includes all necessary gaskets and seals needed for a complete installation
  • Where applicable, metal and resin impellers are offered. See catalog to match pump to this vehicle
  • Be sure to use the proper coolant to maximize cooling system components. See Beck/Arnley catalog for the coolant for this application.
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Carquest Premium – Engine Water Pump: New, Gasket/Seals Included (Part No.T1202)

Engine Water Pump: New, Gasket/Seals Included

from

$74.99
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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Top-Rated Engine Cooling Part Brands For Your 2004 Audi A4

When it comes to finding the perfect Engine Cooling Part for your 2004 Audi A4, Advance Auto Parts has you covered with a wide selection of high-quality OEM and aftermarket options from 10 trusted brands. We carry the most popular Engine Cooling Part brands including Carquest Premium, Dorman, and Beck/Arnley, and more, all known for their exceptional customer ratings (average brand rating of 4.4 stars) and competitive prices, as low as $13.99. Purchasing a Engine Cooling Part from us here at Advance Auto Parts is a smart move for both you and your 2004 Audi A4, providing peace of mind with parts that meet or exceed OEM standards.

Popular Carquest Premium 2004 Audi A4 Engine Cooling Parts

If you’re looking for a top-quality Engine Cooling Part for your 2004 Audi A4, 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 A4 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.
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.”
Standard Reservoir Cap: 20 PSI
from $13.99
(3)
Standard Reservoir Cap: 20 PSI
“Great price”

Top-Quality Dorman 2004 Audi A4 Engine Cooling Parts

For those in search of a high-quality Engine Cooling Part for their 2004 Audi A4, Advance Auto Parts offers a great selection of Dorman Engine Cooling Parts. With 2 Dorman 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 $50.99, with an average price of $181.99, giving you a range of options to suit your budget. Backed by over 3 customer ratings and an average rating of 4.2 stars, Dorman Engine Cooling Parts provide both reliability and excellent performance. Choosing a Dorman Engine Cooling Part from Advance Auto Parts is a smart investment in your vehicle’s performance and longevity.
Radiator Fan Assembly: Dual, Cost Effective & Reliable
from $312.99
(1)
Radiator Fan Assembly: Dual, Cost Effective & Reliable
“Found part in Stock at a great price. Working as designed.”
Pressurized Coolant Reservoir: White, Plastic, Original Equipment Replacement
from $50.99
(2)
Pressurized Coolant Reservoir: White, Plastic, Original Equipment Replacement
“Fits, looks, like the OEM tank. Great price and quality part.”

FAQs for 2004 Audi A4 Engine Cooling Parts

What are the best-selling Engine Cooling Parts for 2004 Audi A4s?

Out of 37 Engine Cooling Parts that fit 2004 Audi A4s, the following parts are the top sellers:

What’s the price range for 2004 Audi A4 Engine Cooling Parts?

The prices of Engine Cooling Parts for the 2004 Audi A4 range from $2.99 up to $331.99 for the most premium parts.

What is the average price of an Engine Cooling Part for a 2004 Audi A4?

The average price for Engine Cooling Parts for the 2004 Audi A4 is $90.64. 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 A4 model years?

Yes, we carry Engine Cooling Parts for 23 model years of Audi A4s between 1996 and 2020. The following model years are the most popular for Engine Cooling Part purchases: 2020, 2019, 2018, 2017, 2016, 2015, 2014, 2013, and 2012.

What are the cheapest Engine Cooling Parts for my 2004 Audi A4?

The cheapest 2004 Audi A4 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 A6 Quattro Engine Cooling Parts, 2004 A6 Engine Cooling Parts, and 2004 TT Quattro Engine Cooling Parts.

What types of Engine Cooling Parts do you sell for my 2004 Audi A4?

As of 11/2/25, these are some of the most in-demand types of Engine Cooling Parts for a 2004 Audi A4:

Can I get help with 2004 Audi A4 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 A4 Engine Cooling Parts?

Advance Auto Parts keeps returns simple. For new Audi A4 Engine Cooling Parts and accessories, your online orders can be returned, in their original condition, within 45 days. For requirements, see the returns page.