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Audi A4 Cooling Expansion Tank Parts

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Coolant Expansion Tank

Plastic reservoir for the coolant system

Brand:
Behr - Corporate Logo
ES#:
3658436
Mfg#:
8K0121403AC
In Stock at Vendor
$130.00

This product was last offered at the strikethrough price on
07-23-2026

$69.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Expansion Tank Vent Hose

ES#436161 - 8E0121107AE - Expansion Tank Vent Hose - Connects coolant expansion tank to the upper radiator hose - Genuine Volkswagen Audi - Audi

Connects coolant expansion tank to the upper radiator hose

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
436161
Mfg#:
8E0121107AE
Ships in 1-2 days
$66.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Expansion Tank Replacement Kit

ES#2649683 - 8E0121403AKT2 - Expansion Tank Replacement Kit - Everything you need to replace your faded, cracked, or leaky expansion tank! - Assembled By ECS - Audi

Everything you need to replace your faded, cracked, or leaky expansion tank! 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
Assembled By ECS - Corporate Logo
ES#:
2649683
Mfg#:
8E0121403AKT2
Ships in 1-2 days
ON SALE!
$65.99

This product was last offered at the strikethrough price on
05-02-2026

$64.57 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Coolant Expansion Tank

ES#2816325 - 8E0121403A - Coolant Expansion Tank - Replace your old coolant tank and stop those pesky leaks - Hamburg Tech - Audi

Replace your old coolant tank and stop those pesky leaks We Price Match - Give Us A Call or Chat!

Brand:
Hamburg Tech - Corporate Logo
ES#:
2816325
Mfg#:
8E0121403A
Ships in 1 Business Day
$32.00 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Coolant Expansion Tank

ES#4901335 - 8W0121405L - Coolant Expansion Tank - Clean up your engine bay or replaced your cracked unit with a new coolant expansion tank - Meyle - Audi

Clean up your engine bay or replaced your cracked unit with a new coolant expansion tank 2X Entries For Our 25th Anniversary Sweepstakes!
We Price Match - Give Us A Call or Chat!
For Vehicles with CYMC Engine Code Only

Brand:
Meyle - Corporate Logo
ES#:
4901335
Mfg#:
8W0121405L
Ships on Nov 20, 2026
Auto Notify
$61.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Coolant Expansion Tank

ES#3189293 - 603-638 - Coolant Expansion Tank - Plastic reservoir for cooling system - Dorman - Audi

Plastic reservoir for cooling system

Brand:
Dorman - Corporate Logo
ES#:
3189293
Mfg#:
603-638
Ships in 4 Business Days
$59.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Expansion Tank Upper Hose

ES#3714099 - 8K0121081AB - Expansion Tank Upper Hose - Overflow relief hose for the radiator - Rein - Audi

Overflow relief hose for the radiator 2X Entries For Our 25th Anniversary Sweepstakes!
We Price Match - Give Us A Call or Chat!

Brand:
Rein - Corporate Logo
ES#:
3714099
Mfg#:
8K0121081AB
In Stock at Vendor
$51.99

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

$50.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Coolant Expansion Tank Hose

ES#4920210 - 8K0121081AH - Coolant Expansion Tank Hose - Located between the coolant expansion tank and the cylinder head coolant flange - URO - Audi

Located between the coolant expansion tank and the cylinder head coolant flange 2X Entries For Our 25th Anniversary Sweepstakes!

Brand:
URO - Corporate Logo
ES#:
4920210
Mfg#:
8K0121081AH
Ships in 1 Business Day
$49.99 USD
Free Shipping
on orders $49 and up

Expansion Tank Cap

ES#2091199 - 8E0121321 - Expansion Tank Cap - Plastic pressure cap for expansion tank - Genuine Volkswagen Audi - Audi

Plastic pressure cap for expansion tank

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
2091199
Mfg#:
8E0121321
Ships in 1-2 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.

$55.99

This product was last offered at the strikethrough price on
07-24-2026

$49.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Screw - Priced Each

ES#467231 - N10003203 - Screw - Priced Each - Install new hardware with your new parts. 4.8x19 - Genuine Volkswagen Audi - Audi Volkswagen

Install new hardware with your new parts. 4.8x19 Secures the expansion tank in the engine bay up to VIN 8D-W-00779, split is in the 1998 model year

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
467231
Mfg#:
N10003203
Ships in 2 Business Days
25% off MSRP

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

$2.78

This product was last offered at the strikethrough price on
05-15-2026

$2.09 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Spring Clamp (21x12) - Priced Each

ES#280095 - 06B145917A - Spring Clamp (21x12) - Priced Each - Spring band clamp used in various areas on your European vehicle - Genuine Volkswagen Audi - Audi

Spring band clamp used in various areas on your European vehicle Secures expansion tank vent hose on both sides

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
280095
Mfg#:
06B145917A
Ships in 1-2 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.

$17.99

This product was last offered at the strikethrough price on
07-24-2026

$15.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Expansion Tank Replacement Kit

ES#2966327 - 8D0121403LXKT1 - Expansion Tank Replacement Kit - Install a brand new expansion tank with a new cap and hardware - Assembled By ECS - Audi Volkswagen

Install a brand new expansion tank with a new cap and hardware 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
Assembled By ECS - Corporate Logo
ES#:
2966327
Mfg#:
8D0121403LXKT1
Ships in 2 Business Days
ON SALE!
$49.99

This product was last offered at the strikethrough price on
05-02-2026

$47.88 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Engine Coolant Recovery Tank

Clean up your engine bay or replaced your cracked unit with a new coolant expansion tank

Brand:
Behr - Corporate Logo
ES#:
2862682
Mfg#:
376737131
In Stock at Vendor
$49.98

This product was last offered at the strikethrough price on
03-06-2026

$47.17 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Expansion Tank Bracket

ES#3250330 - 8W0121232L - Expansion Tank Bracket - Expansion tank bracket that bolts up to the vehicle frame - Genuine Volkswagen Audi - Audi

Expansion tank bracket that bolts up to the vehicle frame

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
3250330
Mfg#:
8W0121232L
Ships in 1-2 days
10% off MSRP

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

$48.99

This product was last offered at the strikethrough price on
07-24-2026

$43.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Coolant Expansion Tank

ES#5388801 - 8D0121403L - Coolant Expansion Tank - Clean up your engine bay or replaced your cracked unit with a new coolant expansion tank - Bremmen Parts - Audi Volkswagen

Clean up your engine bay or replaced your cracked unit with a new coolant expansion tank 10X Entries For Our 25th Anniversary Sweepstakes!
From VIN 8D-W-007800, split is in the 1998 model year

Brand:
Bremmen Parts - Corporate Logo
ES#:
5388801
Mfg#:
8D0121403L
In Stock
ON SALE! SAVE 17%
$23.99

This product was last offered at the strikethrough price on
05-02-2026

$19.93 USD
Free Shipping
on orders $49 and up

Expansion Tank Upper Hose

ES#4858114 - 8K0121081AB - Expansion Tank Upper Hose - Overflow relief hose for the radiator - Vaico - Audi

Overflow relief hose for the radiator We Price Match - Give Us A Call or Chat!

Brand:
Vaico - Corporate Logo
ES#:
4858114
Mfg#:
8K0121081AB
Special Order: No Guaranteed ETA
$37.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

More About Cooling Expansion Tank Parts

A common source of overheating problems is a broken or leaking coolant expansion tank. Replace it with an OEM coolant expansion tank or quality aftermarket expansion tank to prevent future woes.

Let us help you find the parts that fit your Audi

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