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Audi B9 A5 Quattro 2.0T Cabriolet 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.

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 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

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 2X Entries For Our 25th Anniversary Sweepstakes!
We Price Match - Give Us A Call or Chat!

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

Billet Coolant Reservoir Cap - Black Anodized

ES#3509688 - 022731ECS01-01 - Billet Coolant Reservoir Cap - Black Anodized - Lose the plastic! - ECS - Audi

Lose the plastic! 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
ECS - Corporate Logo
ES#:
3509688
Mfg#:
022731ECS01-01
Ships on Dec 10, 2026
$96.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Coolant Expansion Tank Cap

ES#4858532 - 2Q0121321A - Coolant Expansion Tank Cap - Keep proper pressure in your coolant system - Bremmen Parts - Audi Volkswagen Porsche

Keep proper pressure in your coolant system 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
Bremmen Parts - Corporate Logo
ES#:
4858532
Mfg#:
2Q0121321A
In Stock
ON SALE! SAVE 22%
$19.99

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

$15.50 USD
Free Shipping
on orders $49 and up

Expansion Tank Cap - Black

ES#3690266 - 5Q0121321 - Expansion Tank Cap - Black - Keep proper pressure in your coolant system - Vaico - Audi Volkswagen Porsche

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

Brand:
Vaico - Corporate Logo
ES#:
3690266
Mfg#:
5Q0121321
Ships in 1-2 days
$18.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Coolant Expansion Tank

ES#4143346 - 8W0121405L - Coolant Expansion Tank - Clean up your engine bay or replaced your cracked unit with a new coolant expansion tank - Genuine Volkswagen Audi - Audi

Clean up your engine bay or replaced your cracked unit with a new coolant expansion tank For Vehicles with CYMC Engine Code Only

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
4143346
Mfg#:
8W0121405L
Ships in 1-2 days
8% off MSRP

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

$201.99

This product was last offered at the strikethrough price on
07-31-2026

$184.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Audi R8 Expansion Tank Cap

ES#2149010 - 420121321 - Audi R8 Expansion Tank Cap - Keep proper pressure on your coolant, replaces any modern blue or black cooling cap - Genuine Volkswagen Audi - Audi Volkswagen Porsche

Keep proper pressure on your coolant, replaces any modern blue or black cooling cap

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
2149010
Mfg#:
420121321
Ships in 2 Business Days
9% off MSRP

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

$326.99

This product was last offered at the strikethrough price on
07-31-2026

$298.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Expansion Tank Cap - Black

ES#4004591 - 5Q0121321 - Expansion Tank Cap - Black - Keep proper pressure in your coolant system - Rein - Audi Volkswagen Porsche

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

Brand:
Rein - Corporate Logo
ES#:
4004591
Mfg#:
5Q0121321
In Stock
$16.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Expansion Tank Replacement Kit

ES#3969908 - 8w0121405fKT1 - 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 Fits from production date 11/13/2017 up to 1/14/2019

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
3969908
Mfg#:
8W0121405FKT1
Ships in 1-2 days
$252.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Expanding Nut - Priced Each

ES#2891455 - 811807577C - Expanding Nut - Priced Each - Install new hardware with your new parts. - Vaico - Audi Volkswagen

Install new hardware with your new parts. We Price Match - Give Us A Call or Chat!

Brand:
Vaico - Corporate Logo
ES#:
2891455
Mfg#:
811807577C
In Stock
$7.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Expansion Tank Cap - Black

ES#4818658 - 5Q0121321 - Expansion Tank Cap - Black - Keep proper pressure in your coolant system - Bremmen Parts - Audi Volkswagen Porsche

Keep proper pressure in your coolant system 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
Bremmen Parts - Corporate Logo
ES#:
4818658
Mfg#:
5Q0121321
In Stock
ON SALE! SAVE 24%
$15.99

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

$12.23 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Rubber Grommet - Priced Each

ES#2530125 - 4G0121585A - Rubber Grommet - Priced Each - Replace your cracked or dried out components - Used in the lower portion of the expansion tank - Genuine Volkswagen Audi - Audi

Replace your cracked or dried out components - Used in the lower portion of the expansion tank

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
2530125
Mfg#:
4G0121585A
Ships in 1-2 days
$5.99 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

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
07-31-2026

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

Expansion Tank Cap - Black

ES#3970169 - 5Q0121321 - Expansion Tank Cap - Black - Keep proper pressure in your coolant system - Meyle - Audi Volkswagen Porsche

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

Brand:
Meyle - Corporate Logo
ES#:
3970169
Mfg#:
5Q0121321
Ships on Dec 10, 2026
$12.99 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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Manufacturer names and/or part numbers are used only for identification purposes.

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