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Audi B8/B8.5 A4 Quattro V6 3.2L

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Audi B8/B8.5 A4 Quattro V6 3.2L Cooling Expansion Tank Parts

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Coolant Expansion Tank

ES#3412065 - 8K0121405N - Coolant Expansion Tank - Includes the heat shield - Hudson - Audi

Includes the heat shield

Brand:
Hudson - Corporate Logo
ES#:
3412065
Mfg#:
8K0121405N
Ships in 1-2 days
$59.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Grommet Cap - Priced Each

ES#450312 - 8K0129697 - Grommet Cap - Priced Each - Piece that the rubber grommet sits into on the bracket - Genuine Volkswagen Audi - Audi

Piece that the rubber grommet sits into on the bracket

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
450312
Mfg#:
8K0129697
In Stock
$4.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Hex Nut - Priced Each

ES#470213 - N90570802 - Hex Nut - Priced Each - Install new hardware with your new parts. M6 - Genuine Volkswagen Audi - Audi

Install new hardware with your new parts. M6 Used in securing the coolant expansion tank

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
470213
Mfg#:
N90570802
In Stock
19% off MSRP

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

$3.55

This product was last offered at the strikethrough price on
09-04-2026

$2.86 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Coolant T Connector Kit

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 10X Entries Into Our F80 M3 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

Expansion Tank Cap Seal

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 We Price Match - Give Us A Call or Chat!

Brand:
Vaico - Corporate Logo
ES#:
2598146
Mfg#:
1H0121687A
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

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
ON SALE! SAVE 10%
$7.99

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

$7.16 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

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

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
2678371
Mfg#:
8K0121405NKT2
Ships in 1-2 days
$236.99

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

$231.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Coolant Expansion Tank

ES#5492820 - 8K0121405S - Coolant Expansion Tank - Coolant reservoir to cure hairline cracks, resolve false low-coolant warnings, and restore the structural integrity of your pressurized cooling system. - Febi - Audi

Coolant reservoir to cure hairline cracks, resolve false low-coolant warnings, and restore the structural integrity of your pressurized cooling system.

Brand:
Febi - Corporate Logo
ES#:
5492820
Mfg#:
8K0121405S
Special Order: No Guaranteed ETA
$45.99 USD
Free Shipping
on orders $49 and up

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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Manufacturer names and/or part numbers are used only for identification purposes.

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