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Audi B9 A5 Quattro 2.0T Cabriolet

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Audi B9 A5 Quattro 2.0T Cabriolet Cooling Expansion Tank Parts

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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 5X Entries Into Our F80 M3 Sweepstakes
We Price Match - Give Us A Call or Chat!

Brand:
Meyle - Corporate Logo
ES#:
3970169
Mfg#:
5Q0121321
Ships on Oct 5, 2026
$12.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

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

Coolant Expansion Tank

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

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
4307416
Mfg#:
8W0121405K
Ships in 1 day
9% off MSRP

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

$76.99

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

$69.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Expansion Tank Replacement Kit

ES#3969909 - 8w0121405gKT1 - 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 1/14/2019

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
3969909
Mfg#:
8W0121405GKT1
Ships in 2 Business Days
$252.99

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

$248.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Expansion Tank Replacement Kit

ES#3969907 - 8w0121405eKT - 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 up to production date 11/13/2017

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
3969907
Mfg#:
8W0121405EKT
Ships in 2 Business Days
$252.99

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

$248.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Coolant Expansion Tank

ES#5492873 - 8W0121405L - Coolant Expansion Tank - Coolant expansion tank to cure mysterious coolant loss, resolve false dashboard warnings, and restore reliable engine cooling and aesthetics to your B9 chassis Audi. - Febi - Audi

Coolant expansion tank to cure mysterious coolant loss, resolve false dashboard warnings, and restore reliable engine cooling and aesthetics to your B9 chassis Audi. For Vehicles with CYMC Engine Code Only

Brand:
Febi - Corporate Logo
ES#:
5492873
Mfg#:
8W0121405L
Special Order: No Guaranteed ETA
$78.99 USD

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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