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Audi S4 Cooling Expansion Tank Parts

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Expansion Tank Cap

ES#3970648 - 8E0121321 - Expansion Tank Cap - Plastic pressure cap for expansion tank - Meyle - Audi

Plastic pressure cap for expansion tank 2X Entries For Our 25th Anniversary Sweepstakes!
We Price Match - Give Us A Call or Chat!

Brand:
Meyle - Corporate Logo
ES#:
3970648
Mfg#:
8E0121321
Ships on Dec 1, 2026
$9.16 USD
Free Shipping
on orders $49 and up

Expansion Tank Cap

ES#2535171 - 443121321 - Expansion Tank Cap - Keep proper pressure on your coolant - URO - Audi Volkswagen

Keep proper pressure on your coolant 2X Entries For Our 25th Anniversary Sweepstakes!
We Price Match - Give Us A Call or Chat!

Brand:
URO - Corporate Logo
ES#:
2535171
Mfg#:
443121321
Ships in 1 Business Day
$2.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Expansion Tank Cap

ES#2815697 - 3B0121321 - Expansion Tank Cap - Keep proper pressure in your coolant system - Hamburg Tech - Audi Volkswagen

Keep proper pressure in your coolant system We Price Match - Give Us A Call or Chat!

Brand:
Hamburg Tech - Corporate Logo
ES#:
2815697
Mfg#:
3B0121321
Ships in 1 Business Day
$7.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Expansion Tank Cap

ES#4066648 - 8E0121321 - Expansion Tank Cap - Hamburg Tech - Audi

We Price Match - Give Us A Call or Chat!

Brand:
Hamburg Tech - Corporate Logo
ES#:
4066648
Mfg#:
8E0121321
Ships in 1 Business Day
$7.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Expansion Tank Cap

ES#2561872 - 1J0121321B - Expansion Tank Cap - Keep proper pressure on your coolant - Meyle - Audi

Keep proper pressure on your coolant 2X Entries For Our 25th Anniversary Sweepstakes!
We Price Match - Give Us A Call or Chat!

Brand:
Meyle - Corporate Logo
ES#:
2561872
Mfg#:
1J0121321B
Ships on Dec 1, 2026
$7.54 USD
Free Shipping
on orders $49 and up

Expansion Tank Cap

ES#10455 - 443121321 - Expansion Tank Cap - Keep proper pressure on your coolant - Febi - Audi Volkswagen

Keep proper pressure on your coolant 2X Entries For Our 25th Anniversary Sweepstakes!
We Price Match - Give Us A Call or Chat!

Brand:
Febi - Corporate Logo
ES#:
10455
Mfg#:
443121321
In Stock at Vendor
$6.11 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Expansion Tank Cap

ES#2102281 - 8E0121321 - Expansion Tank Cap - Plastic pressure cap for expansion tank - MTC - Audi

Plastic pressure cap for expansion tank

Brand:
MTC - Corporate Logo
ES#:
2102281
Mfg#:
8E0121321
Back Ordered
$5.99 USD
Free Shipping
on orders $49 and up

Expansion Tank Cap

ES#3672033 - 3C0121321 - Expansion Tank Cap - Keep proper pressure in your coolant system - Stant - Audi Volkswagen Porsche

Keep proper pressure in your coolant system

Brand:
Stant - Corporate Logo
ES#:
3672033
Mfg#:
3C0121321
Back Ordered
$5.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Expansion Tank Cap

Keep proper pressure on your coolant We Price Match - Give Us A Call or Chat!

Brand:
Hamburg Tech - Corporate Logo
ES#:
2815739
Mfg#:
443121321
Ships in 1 Business Day
$3.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Expansion Tank Cap

Plastic pressure cap for expansion tank

Brand:
Hudson - Corporate Logo
ES#:
3463373
Mfg#:
8E0121321
Ships in 1 day
$5.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Expansion Tank Replacement Kit

ES#4810244 - 8w1121405n2KT - Expansion Tank Replacement Kit - Genuine Volkswagen Audi - Audi

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
4810244
Mfg#:
8W1121405N2KT
Ships in 1 day
$226.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Partial Replacement

Cooling System Refresh Kit - Level 2

ES#4691027 - 8W1121405NKT - Cooling System Refresh Kit - Level 2 - Replace your thermostat, temp sensor, and expansion tank after performing a proper coolant system flush! - Genuine Volkswagen Audi - Audi

Replace your thermostat, temp sensor, and expansion tank after performing a proper coolant system flush!

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
4691027
Mfg#:
8W1121405NKT
Ships in 1 day
$565.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Partial Replacement

Expansion Tank Replacement Kit

ES#4810246 - 8W1121405N3KT - Expansion Tank Replacement Kit - Freshen up your engine bay! - Assembled By ECS - Audi

Freshen up your engine bay! 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
Assembled By ECS - Corporate Logo
ES#:
4810246
Mfg#:
8W1121405N3KT
Ships in 4 Business Days
ON SALE!
$228.99

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

$222.08 USD
Free Shipping
on orders $49 and up

Expansion Tank Replacement Kit

ES#2678371 - 8K0121405NKT2 - Expansion Tank Replacement Kit - Install a brand new expansion tank with a new cap and hardware - Genuine Volkswagen Audi - Audi

Install a brand new expansion tank with a new cap and hardware From production date 5/2/2011

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
2678371
Mfg#:
8K0121405NKT2
Ships in 3 Business Days
$236.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Expansion Tank Replacement Kit

ES#2678372 - 8K0121405FKT2 - Expansion Tank Replacement Kit - Install a brand new expansion tank with a new cap and hardware - Genuine Volkswagen Audi - Audi

Install a brand new expansion tank with a new cap and hardware Up to production date 5/1/2011

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
2678372
Mfg#:
8K0121405FKT2
Ships in 3 Business Days
$236.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Cooling System Refresh Kit - Level 2

ES#4691355 - 8W1121405N1KT - Cooling System Refresh Kit - Level 2 - Replace your thermostat, temp sensor, and expansion tank after performing a proper coolant system flush! - Assembled By ECS - Audi

Replace your thermostat, temp sensor, and expansion tank after performing a proper coolant system flush! 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
Assembled By ECS - Corporate Logo
ES#:
4691355
Mfg#:
8W1121405N1KT
Ships in 10 Business Days
$434.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Partial 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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