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Audi B5 Engine Cooling Parts

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Auxiliary Water Pump Hose

ES#6800 - 078121082E - Auxiliary Water Pump Hose - Connects the auxiliary water pump to the coolant pipe under the intake manifold - Original Equipment Supplier - Audi

Connects the auxiliary water pump to the coolant pipe under the intake manifold

Brand:
Original Equipment Supplier - Corporate Logo
ES#:
6800
Mfg#:
078121082E
Back Ordered
$24.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Coolant Expansion Tank

ES#2816256 - 8D0121403D - Coolant Expansion Tank - Includes integrated coolant level sensor - Hamburg Tech - Audi

Includes integrated coolant level sensor We Price Match - Give Us A Call or Chat!
Up to VIN 8D-W-007799, split is in the 1998 model year

Brand:
Hamburg Tech - Corporate Logo
ES#:
2816256
Mfg#:
8D0121403D
Ships in 2 Business Days
$24.95 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Radiator Hose - Lower

ES#2802751 - 8D0121055E - Radiator Hose - Lower - Connects lower radiator port to the thermostat housing - Rein - Audi Volkswagen

Connects lower radiator port to the thermostat housing 2X Entries Into Our F80 M3 Sweepstakes
We Price Match - Give Us A Call or Chat!
Engine code AHA up to VIN 8D-X-003500, split is in the 1999 model year

Brand:
Rein - Corporate Logo
ES#:
2802751
Mfg#:
8D0121055E
Ships in 4 Business Days
ON SALE!
$25.99

This product was last offered at the strikethrough price on
08-31-2026

$24.69 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Coolant Expansion Tank

ES#2802911 - 8D0121403L - Coolant Expansion Tank - Includes integrated coolant level sensor, does not include cap - Rein - Audi Volkswagen

Includes integrated coolant level sensor, does not include cap 2X Entries Into Our F80 M3 Sweepstakes
We Price Match - Give Us A Call or Chat!
From VIN 8D-W-007800, split is in the 1998 model year

Brand:
Rein - Corporate Logo
ES#:
2802911
Mfg#:
8D0121403L
Ships in 4 Business Days
ON SALE!
$25.99

This product was last offered at the strikethrough price on
08-31-2026

$24.69 USD
Free Shipping
on orders $49 and up

Multipurpose Relay - Priced Each

ES#3437886 - 4H0951253 - Multipurpose Relay - Priced Each - Replacement 4 pin relay - Flosser - Audi Volkswagen

Replacement 4 pin relay Used for fan control

Brand:
Flosser - Corporate Logo
ES#:
3437886
Mfg#:
4H0951253
Ships in 2 Business Days
$11.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Coolant Temperature Sensor - 4 Pin

ES#2813144 - 078919501B - Coolant Temperature Sensor - 4 Pin - Blue sensor with square connector. Please check existing sensor color - Hamburg Tech - Audi Volkswagen

<font color='blue'>Blue</font> sensor with square connector. Please check existing sensor color We Price Match - Give Us A Call or Chat!
Up to VIN 8D-X-500000, split is in the 1999 model year

Brand:
Hamburg Tech - Corporate Logo
ES#:
2813144
Mfg#:
078919501B
In Stock at Vendor
ON SALE! SAVE 20%
$14.99

This product was last offered at the strikethrough price on
09-03-2026

$11.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Multipurpose Relay - Priced Each

Replacement 4 pin relay Used for fan control

Brand:
Wehrle - Corporate Logo
ES#:
3437884
Mfg#:
4H0951253
Ships in 3 Business Days
$12.99

This product was last offered at the strikethrough price on
07-15-2026

$11.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Coolant Expansion Tank

ES#2816257 - 8D0121403L - Coolant Expansion Tank - Includes integrated coolant level sensor - Hamburg Tech - Audi Volkswagen

Includes integrated coolant level sensor We Price Match - Give Us A Call or Chat!
From VIN 8D-W-007800, split is in the 1998 model year

Brand:
Hamburg Tech - Corporate Logo
ES#:
2816257
Mfg#:
8D0121403L
Ships in 2 Business Days
$23.85 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Sealing O-Ring - Priced Each

ES#277620 - 058121687 - Sealing O-Ring - Priced Each - Seals the coolant flange to the water supply pipe. 31.5x3.65 - Genuine Volkswagen Audi - Audi Volkswagen

Seals the coolant flange to the water supply pipe. 31.5x3.65

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
277620
Mfg#:
058121687
Ships in 3 Business Days
11% off MSRP

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$13.34

This product was last offered at the strikethrough price on
08-03-2026

$11.88 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Thermostat - 92�C

ES#5270 - 078121113G - Thermostat - 92C - Includes sealing O-Ring - Mahle-Behr - Audi Volkswagen

Includes sealing O-Ring From VIN 8D-X-315001, split is in the 1999 model year

Brand:
Mahle-Behr - Corporate Logo
ES#:
5270
Mfg#:
078121113G
Ships in 2 Business Days
$22.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Multipurpose Relay - Priced Each

ES#2901202 - 7M0951253A - Multipurpose Relay - Priced Each - Replacement 4 pin relay - Vemo - Audi Volkswagen Porsche

Replacement 4 pin relay Used for fan control

Brand:
Vemo - Corporate Logo
ES#:
2901202
Mfg#:
7M0951253A
Ships in 2 Business Days
$22.99

This product was last offered at the strikethrough price on
05-07-2026

$21.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Throttle Body Coolant Hose - left

ES#283609 - 078121188B - Throttle Body Coolant Hose - left - Connects the coolant pipe to the throttle body - Genuine Volkswagen Audi - Audi Volkswagen

Connects the coolant pipe to the throttle body Engine code ATQ

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
283609
Mfg#:
078121188B
Ships in 5 Business Days
12% off MSRP

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$24.99

This product was last offered at the strikethrough price on
09-10-2026

$21.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Thermostat - 80°C

ES#3149471 - 075121113D - Thermostat - 80C - Does not include sealing O-Ring - Wahler - Audi Volkswagen

Does not include sealing O-Ring Lower temperature thermostat, stock is 87°C

Brand:
Wahler - Corporate Logo
ES#:
3149471
Mfg#:
075121113D
Ships on Oct 6, 2026
$21.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Expansion Tank Cap

ES#2709072 - 8E0121321 - Expansion Tank Cap - Plastic pressure cap for expansion tank - URO - Audi

Plastic pressure cap for expansion tank 2X Entries Into Our F80 M3 Sweepstakes
We Price Match - Give Us A Call or Chat!

Brand:
URO - Corporate Logo
ES#:
2709072
Mfg#:
8E0121321
Ships in 2 Business Days
$6.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Freeze Plug - 36mm

ES#261775 - 059103113 - Freeze Plug - 36mm - Keep your engine block sealed - Febi - Audi Volkswagen

Keep your engine block sealed We Price Match - Give Us A Call or Chat!

Brand:
Febi - Corporate Logo
ES#:
261775
Mfg#:
059103113
Ships in 2 Business Days
$3.99

This product was last offered at the strikethrough price on
05-07-2026

$2.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Radiator Attachment Bolt - Priced Each

ES#10968 - 8D0121200 - Radiator Attachment Bolt - Priced Each - Secures the radiator to the core support - Genuine Volkswagen Audi - Audi

Secures the radiator to the core support

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
10968
Mfg#:
8D0121200
Ships in 3 Business Days
$2.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

More About Engine Cooling Parts

Optimize your engine cooling system performance and heater output with quality drive belts, coolant hoses, cooling system parts, and approved coolant fluids from ECS Tuning. Head off expensive repairs and untimely breakdowns with regularly scheduled cooling system inspection and maintenance.

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