How to replace the coolant reservoir and radiator on Audi A4?

To carry out the task of replacement of the radiator, first raise the front of the vehicle and hold it firmly on jackstands. Take off the bottom splash cover and empty the cooling system. Secondly, remove engine covers and front bumper and in 2.0L models, position radiator support panel in service position. Detach the upper and lower transaxle cooler lines of the automatic and seal them with a cap. Have the upper and bottom radiator hose clips lifted to detach the hose to the radiator and twist them (where needed) to release the O-ring. Take out the ducts by removing the air duct fasteners of either side of the radiator. Unplug the air conditioning pressure switch and ambient temperature sensor on the driver side of radiator and position the harness aside. Disassemble the mounting fasteners of the power steering cooler and drop the cooler without unscrewing the lines where provided. Removal of air conditioning condenser mounting fasteners and rotate the condenser out of and down the radiator, careful not to kink, stretch or bend the air conditioning lines. Unscrew the two radiator mounting pins, push the pins upwards to unscrew then remove the radiator. Installation of new radiator Before fitting the new radiator, replace any damaged hose clips, radiator hoses, and O-rings. Installation is done in the same manner as it is removed. Installation Refill and bleed the system and then start the engine checking all the leaks. In the case of expansion tank, empty the cooling system by draining it until the coolant drier is removed. Removal: Before removing the tank out of the engine compartment, take out the expansion tank mounting screw, lift the tank and disconnect the coolant level sensor connector. The reservoir should be clean and clear, so wash the reservoir with soapy water, and rinse thoroughly, etc. Installation is done in the same manner as it is removed.

Genuine Audi A4 Radiator

Cooling Radiator

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Audi A4 Radiator Part Number: 8D0-121-251-AP
$190.40 MSRP: $266.67
You Save: $76.27 (29%)
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Product Specifications
- Replaces: 8D0-121-251-AN
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2000-2001 Audi A4 | Base | 6 Cyl 2.8 L GAS
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Audi A4 Radiator Part Number: 8E0-121-251-AP
$285.60 MSRP: $400.00
You Save: $114.40 (29%)
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Product Specifications
- Replaces: 8E0-121-251-AE
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2005-2009 Audi A4 | Base, Cabriolet | 4 Cyl 1.8 L GAS, 4 Cyl 2.0 L GAS
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Audi A4 Radiator Part Number: 8D0-121-251-BD
$307.73 MSRP: $431.00
You Save: $123.27 (29%)
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Product Specifications
- Replaces: 8D0-121-251-AM
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2000-2001 Audi A4 | Base | 6 Cyl 2.8 L GAS
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Audi A4 Radiator Part Number: 8K0-121-251-L
$372.47 MSRP: $521.67
You Save: $149.20 (29%)
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Product Specifications
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2009-2016 Audi A4 | Base, Premium, Premium Plus, Prestige | 4 Cyl 2.0 L GAS
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Audi A4 Radiator Part Number: 8W0-121-251-AK
$416.50 MSRP: $583.34
You Save: $166.84 (29%)
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Product Specifications
- Replaces: 8W0-121-251-L
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2017-2020 Audi A4 | Premium, Premium Plus, Prestige, Titanium | 4 Cyl 2.0 L GAS
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Audi A4 Radiator Part Number: 8E0-121-251-AS
$389.71 MSRP: $545.81
You Save: $156.10 (29%)
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Product Specifications
- Replaces: 8E0-121-251-S
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2003-2005 Audi A4 | Cabriolet | 6 Cyl 3.0 L GAS
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Audi A4 Radiator Part Number: 8E0-121-251-A
$432.67 MSRP: $605.98
You Save: $173.31 (29%)
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Product Specifications
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2002-2008 Audi A4 | Base, Cabriolet | 4 Cyl 1.8 L GAS, 4 Cyl 2.0 L GAS
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Audi A4 Radiator Part Number: 8K0-121-251-AJ
$458.15 MSRP: $641.67
You Save: $183.52 (29%)
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Product Specifications
- Replaces: 8K0-121-251-K, 8K0-121-251-T
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2009-2016 Audi A4 | Base, Premium, Premium Plus, Prestige | 4 Cyl 2.0 L GAS
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Audi A4 Radiator Part Number: 8E0-121-251-AQ
$524.42 MSRP: $734.48
You Save: $210.06 (29%)
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Product Specifications
- Replaces: 8E0-121-251-L
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2002-2006 Audi A4 | Base, Cabriolet | 4 Cyl 1.8 L GAS, 4 Cyl 2.0 L GAS
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Audi A4 Radiator Part Number: 8E0-121-251-C
$484.91 MSRP: $679.15
You Save: $194.24 (29%)
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Product Specifications
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2002-2008 Audi A4 | Base | 6 Cyl 3.0 L GAS, 6 Cyl 3.2 L GAS
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Audi A4 Radiator Part Number: 8E0-121-251-AR
$684.24 MSRP: $958.31
You Save: $274.07 (29%)
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Product Specifications
- Replaces: 8E0-121-251-M
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2002-2008 Audi A4 | Base, Cabriolet | 6 Cyl 3.0 L GAS, 6 Cyl 3.2 L GAS

Audi A4 Radiator

The Audi A4 Radiator maintains the engine of the sedan at a cool temperature by functioning as a small heat exchanger to transfer heat in the circulating coolant to the air flowing through the front grille. In each generation of the Audi, the coolant exits the engine block, entering a system of small aluminum tubes that cool it as it passes across tightly spaced fins, which rapidly pull heat into the airflow that passes through the car or the electric fan. The faster this convection process, the colder the liquid will be, and it will return to the engine, preventing the possibility of metal warping. There have been two styles of construction applied in various model years, one is an older copper or brass Radiator, which is not only very good at heat transfer but adds some mass, and the other is a lighter aluminum Radiator with plastic or aluminum tanks, which is less massive and resistant to corrosion. The two designs protrude on the front of the Audi to capture as much fresh air as possible. Although the material has changed, the fundamental task and the flow pattern of the internals have not changed, which shows a constant cooling philosophy in the Audi models. The highly frequent failure is the leak, which happens when tubes crack or seams fail, and small holes can be patched or depressions repaired, but all can be entirely replaced to provide full control of pressure. Knowing these fundamentals, the owners of Audi can know how a proper Radiator can protect the life of the engine and help to maintain the legendary badge of A4 on the road.

Choose original equipment manufacturer Radiator for great performance and strong durability. They use Audi's official craftsmanship and high-grade materials, and meet strict quality standards. Are you looking for quality Radiator at a good price? Come to our online store. We carry a wide range of genuine parts for your Audi A4 and the prices are competitive. Each part comes with the manufacturer's warranty. You can install with confidence and get steady results. Over time, you'll save money and avoid hassle. Keep your maintenance simple and protect your vehicle with OEM parts. Get the quality your A4 needs now.

Audi A4 Radiator Parts and Q&A

Radiator
8E0-121-251-A
Q: How to replace the coolant reservoir and radiator on Audi A4?
A:
To carry out the task of replacement of the radiator, first raise the front of the vehicle and hold it firmly on jackstands. Take off the bottom splash cover and empty the cooling system. Secondly, remove engine covers and front bumper and in 2.0L models, position radiator support panel in service position. Detach the upper and lower transaxle cooler lines of the automatic and seal them with a cap. Have the upper and bottom radiator hose clips lifted to detach the hose to the radiator and twist them (where needed) to release the O-ring. Take out the ducts by removing the air duct fasteners of either side of the radiator. Unplug the air conditioning pressure switch and ambient temperature sensor on the driver side of radiator and position the harness aside. Disassemble the mounting fasteners of the power steering cooler and drop the cooler without unscrewing the lines where provided. Removal of air conditioning condenser mounting fasteners and rotate the condenser out of and down the radiator, careful not to kink, stretch or bend the air conditioning lines. Unscrew the two radiator mounting pins, push the pins upwards to unscrew then remove the radiator. Installation of new radiator Before fitting the new radiator, replace any damaged hose clips, radiator hoses, and O-rings. Installation is done in the same manner as it is removed. Installation Refill and bleed the system and then start the engine checking all the leaks. In the case of expansion tank, empty the cooling system by draining it until the coolant drier is removed. Removal: Before removing the tank out of the engine compartment, take out the expansion tank mounting screw, lift the tank and disconnect the coolant level sensor connector. The reservoir should be clean and clear, so wash the reservoir with soapy water, and rinse thoroughly, etc. Installation is done in the same manner as it is removed.