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Audi A4 Cooling Expansion Tank Parts

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Porsche 911 Expansion Tank Cap

ES#3496004 - 99110645702 - Porsche 911 Expansion Tank Cap - Black and satin aluminum colored coolant cap from the Porsche 991. - Genuine Porsche - Audi Volkswagen Porsche

Black and satin aluminum colored coolant cap from the Porsche 991. affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
Genuine Porsche - Corporate Logo
ES#:
3496004
Mfg#:
99110645702
In Stock
$53.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Audi R8 Expansion Tank Cap

ES#4691207 - 420121321 - Audi R8 Expansion Tank Cap - Keep proper pressure on your coolant, replaces any modern blue or black cooling cap - Bremmen Parts - Audi Volkswagen Porsche

Keep proper pressure on your coolant, replaces any modern blue or black cooling cap affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
Bremmen Parts - Corporate Logo
ES#:
4691207
Mfg#:
420121321
In Stock
ON SALE! SAVE 14%
$34.99

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

$29.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Expansion Tank Cap

ES#253082 - 3B0121321 - Expansion Tank Cap - Keep proper pressure in your coolant system - Genuine Volkswagen Audi - Audi Volkswagen

Keep proper pressure in your coolant system affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
253082
Mfg#:
3B0121321
In Stock
25% off MSRP

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

$39.59

This product was last offered at the strikethrough price on
01-08-2026

$29.67 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

CTS Coolant Tank Cap

ES#4620720 - CTS-ACC-009 - CTS Coolant Tank Cap - Lose the plastic! - CTS - Audi Volkswagen

Lose the plastic! affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
CTS - Corporate Logo
ES#:
4620720
Mfg#:
CTS-ACC-009
In Stock
$69.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Coolant Expansion Tank

ES#4220544 - 8K0121403AC - Coolant Expansion Tank - Plastic reservoir for the coolant system - Febi - Audi Porsche

Plastic reservoir for the coolant system affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
We Price Match - Give Us A Call or Chat!

Brand:
Febi - Corporate Logo
ES#:
4220544
Mfg#:
8K0121403AC
In Stock
$56.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Expansion Tanks Breather Line

ES#4008182 - 8W0121081ED - Expansion Tanks Breather Line - keep your engine temps where they are supposed to be! - Genuine Volkswagen Audi - Audi

keep your engine temps where they are supposed to be! affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
4008182
Mfg#:
8W0121081ED
In Stock
5% off MSRP

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

$36.99

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

$34.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Coolant Expansion Tank

ES#4753021 - 8W0121405L - Coolant Expansion Tank - Clean up your engine bay or replaced your cracked unit with a new coolant expansion tank - URO - Audi

Clean up your engine bay or replaced your cracked unit with a new coolant expansion tank affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
We Price Match - Give Us A Call or Chat!

Brand:
URO - Corporate Logo
ES#:
4753021
Mfg#:
8W0121405L
In Stock
$81.99 USD
Free Shipping

Coolant Expansion Tank

ES#2535176 - 8E0121403 - Coolant Expansion Tank - Keep your cooling system efficient - URO - Audi

Keep your cooling system efficient affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
We Price Match - Give Us A Call or Chat!

Brand:
URO - Corporate Logo
ES#:
2535176
Mfg#:
8E0121403
In Stock
$27.59 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Expansion Tank Upper Hose

ES#450265 - 8K0121081AB - Expansion Tank Upper Hose - Overflow relief hose for the radiator - Genuine Volkswagen Audi - Audi

Overflow relief hose for the radiator affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
450265
Mfg#:
8K0121081AB
Ships in 1-2 days
28% off MSRP

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

$60.00

This product was last offered at the strikethrough price on
02-23-2026

$42.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Coolant Expansion Tank

ES#4818675 - 8K0121403AC - Coolant Expansion Tank - Plastic reservoir for the coolant system - Bremmen Parts - Audi Porsche

Plastic reservoir for the coolant system affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
Bremmen Parts - Corporate Logo
ES#:
4818675
Mfg#:
8K0121403AC
In Stock
ON SALE! SAVE 17%
$37.99

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

$31.44 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Coolant Expansion Tank Cap

ES#3485290 - 2Q0121321A - Coolant Expansion Tank Cap - Keep proper pressure in your coolant system - Genuine Volkswagen Audi - Audi Volkswagen Porsche

Keep proper pressure in your coolant system affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
3485290
Mfg#:
2Q0121321A
In Stock
2% off MSRP

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

$42.99

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

$41.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Coolant Expansion Tank Replacement Kit

ES#2593538 - 8K0121403QKT - Coolant Expansion Tank Replacement Kit - Everything you need to replace your faded, cracked, or leaky expansion tank! - Genuine Volkswagen Audi - Audi

Everything you need to replace your faded, cracked, or leaky expansion tank! affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
2593538
Mfg#:
8K0121403QKT
Ships in 1-2 days
$140.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Coolant Expansion Tank Hose

ES#4818674 - 8K0121081AH - Coolant Expansion Tank Hose - Located between the coolant expansion tank and the cylinder head coolant flange - Bremmen Parts - Audi

Located between the coolant expansion tank and the cylinder head coolant flange affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
Bremmen Parts - Corporate Logo
ES#:
4818674
Mfg#:
8K0121081AH
In Stock
ON SALE! SAVE 20%
$45.99

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

$36.71 USD
Free Shipping
on orders $49 and up

Coolant Expansion Tank

ES#3580590 - 8K0121405N - Coolant Expansion Tank - Includes the heat shield - URO - Audi

Includes the heat shield affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
We Price Match - Give Us A Call or Chat!

Brand:
URO - Corporate Logo
ES#:
3580590
Mfg#:
8K0121405N
In Stock
$43.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Coolant Expansion Tank Replacement Kit

ES#3658445 - 3b0121321ktKT2 - Coolant 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! affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
Assembled By ECS - Corporate Logo
ES#:
3658445
Mfg#:
3B0121321KTKT2
Ships on Jun 8, 2026
ON SALE! SAVE 13%
$61.99

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

$53.69 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Coolant Expansion Tank

ES#3623896 - 8K0121403Q - Coolant Expansion Tank - Plastic reservoir for the coolant system - URO - Audi Porsche

Plastic reservoir for the coolant system affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
We Price Match - Give Us A Call or Chat!

Brand:
URO - Corporate Logo
ES#:
3623896
Mfg#:
8K0121403Q
In Stock
$28.99 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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