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Audi A4 Cooling Expansion Tank Parts

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ES#429389 - 8D0121107C - Expansion Tank Hose - Connects the expansion tank to the hard water pipe - Genuine Volkswagen Audi - Audi Volkswagen

Connects the expansion tank to the hard water pipe affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
429389
Mfg#:
8D0121107C
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.

$37.99

This product was last offered at the strikethrough price on
06-07-2026

$33.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement
ES#2586883 - 8D0121403DUROKT -  Expansion Tank Replacement Kit - Install a brand new expansion tank with a new cap and hardware - Assembled By ECS - Audi

Install a brand new expansion tank with a new cap and hardware affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes!
Up to VIN 8D-W-007799, split is in the 1998 model year

Brand:
Assembled By ECS - Corporate Logo
ES#:
2586883
Mfg#:
8D0121403DUROKT
Back Ordered
ON SALE!
$34.99

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

$33.45 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement
ES#3176255 - N90692901KT - Coolant T Connector Kit - Connects lower radiator hose to expansion tank - Includes clamps - Assembled By ECS - Audi

Connects lower radiator hose to expansion tank - Includes clamps affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes!
Connects lower radiator hose to the coolant expansion tank

Brand:
Assembled By ECS - Corporate Logo
ES#:
3176255
Mfg#:
N90692901KT
Ships in 1 Business Day
ON SALE! SAVE 10%
$35.99

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

$32.31 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement
ES#2816324 - 8E0121403 - Coolant Expansion Tank - Plastic reservoir for cooling system - Hamburg Tech - Audi

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

Brand:
Hamburg Tech - Corporate Logo
ES#:
2816324
Mfg#:
8E0121403
Ships in 1 Business Day
$30.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement
ES#3235890 - 8D0121109N - Expansion Tank Hose - (NO LONGER AVAILABLE) - Runs from the bottom of the expansion tank to the water pipe - Gates - Audi Volkswagen

Runs from the bottom of the expansion tank to the water pipe affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
Gates - Corporate Logo
ES#:
3235890
Mfg#:
8D0121109N
Ships on Jun 25, 2026
$30.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement
ES#1689 - 8D0121403D - Coolant Expansion Tank - Includes integrated coolant level sensor - Meyle - Audi

Includes integrated coolant level sensor affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
We Price Match - Give Us A Call or Chat!
Up to VIN 8D-W-007799, split is in the 1998 model year

Brand:
Meyle - Corporate Logo
ES#:
1689
Mfg#:
8D0121403D
Ships on Oct 15, 2026
$31.20

This product was last offered at the strikethrough price on
12-29-2025

$30.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement
ES#2709072 - 8E0121321 - Expansion Tank Cap - Plastic pressure cap for expansion tank - URO - Audi

Plastic pressure cap for 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#:
2709072
Mfg#:
8E0121321
Ships in 1 Business Day
$6.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement
ES#2598146 - 1H0121687A - Expansion Tank Cap Seal - Seals the expansion tank cap to the reservoir. 28.5x3.8 - Vaico - Audi Volkswagen

Seals the expansion tank cap to the reservoir. 28.5x3.8 affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
We Price Match - Give Us A Call or Chat!

Brand:
Vaico - Corporate Logo
ES#:
2598146
Mfg#:
1H0121687A
In Stock at Vendor
$3.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement
ES#3139155 - 8E0121403 - Coolant Expansion Tank - Plastic reservoir for cooling system - Hudson - Audi

Plastic reservoir for cooling system affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
Hudson - Corporate Logo
ES#:
3139155
Mfg#:
8E0121403
Ships in 1 day
$27.00 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement
ES#3412050 - 8D0121403D - Coolant Expansion Tank - Includes integrated coolant level sensor - Hudson - Audi

Includes integrated coolant level sensor affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Up to VIN 8D-W-007799, split is in the 1998 model year

Brand:
Hudson - Corporate Logo
ES#:
3412050
Mfg#:
8D0121403D
Ships in 1 day
$27.00 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement
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 affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
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 3 Business Days
$25.99 USD
Free Shipping
on orders $49 and up
ES#2816256 - 8D0121403D - Coolant Expansion Tank - Includes integrated coolant level sensor - Hamburg Tech - Audi

Includes integrated coolant level sensor affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
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 1 Business Day
$24.95 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement
ES#3189489 - 627-006 - Coolant T Connector - Connects to the lower radiator hose - Dorman - Audi Volkswagen

Connects to the lower radiator hose affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
Dorman - Corporate Logo
ES#:
3189489
Mfg#:
627-006
Ships in 4 Business Days
$23.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement
ES#2816257 - 8D0121403L - Coolant Expansion Tank - Includes integrated coolant level sensor - Hamburg Tech - Audi Volkswagen

Includes integrated coolant level sensor affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
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 1 Business Day
$23.85 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement
ES#2802007 - 1J0121321B - Expansion Tank Cap - Keep proper pressure on your coolant - Rein - Audi Volkswagen Porsche

Keep proper pressure on your coolant affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
We Price Match - Give Us A Call or Chat!

Brand:
Rein - Corporate Logo
ES#:
2802007
Mfg#:
1J0121321B
Ships on Jun 23, 2026
$10.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement
ES#2815697 - 3B0121321 - Expansion Tank Cap - Keep proper pressure in your coolant system - Hamburg Tech - Audi Volkswagen

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

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.

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