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Audi B5 A4 Quattro V6 30v Engine Thermostat Parts

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ES#3659371 - 078121121J - Thermostat Housing (Aluminum) - Aluminum design - Located on the front right of the engine block - URO - Audi Volkswagen

Aluminum design - Located on the front right of the engine block 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#:
3659371
Mfg#:
078121121J
In Stock
$155.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement
ES#4151982 - N90945002 - Allen/Hex Bolt - Priced Each - Install new hardware with your new parts. M7x21.5mm - Rein - Audi Volkswagen

Install new hardware with your new parts. M7x21.5mm 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#:
4151982
Mfg#:
N90945002
In Stock
$5.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement
ES#1892327 - 078121113F - Thermostat - 87C - Prevent overheating and premature engine wear - Mahle-Behr - Audi Volkswagen

Prevent overheating and premature engine wear affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Up to VIN 8D-X-315000, split is in the 1999 model year

Brand:
Mahle-Behr - Corporate Logo
ES#:
1892327
Mfg#:
078121113F
In Stock
$28.99

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

$20.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement
ES#2713078 - 075121113D -  Thermostat - 80C - Includes sealing O-Ring - Vemo - Audi Volkswagen

Includes sealing O-Ring affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Lower temperature thermostat, stock is 87°C

Brand:
Vemo - Corporate Logo
ES#:
2713078
Mfg#:
075121113D
In Stock at Vendor
$18.99

This product was last offered at the strikethrough price on
05-07-2026

$17.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement
ES#6957 - 075121113D 71D - Thermostat - 71C - Keep your engine running cooler for more power - Mahle-Behr - Audi Volkswagen

Keep your engine running cooler for more power affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Lower temperature thermostat than factory - OE is 87°C

Brand:
Mahle-Behr - Corporate Logo
ES#:
6957
Mfg#:
075121113D 71D
In Stock
$28.99

This product was last offered at the strikethrough price on
02-09-2026

$28.69 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement
ES#4858162 - 034-102-7005 - Low Temp Thermostat - 70 Degree C - Get faster coolant circulation through the radiator for cooler running. - 034Motorsport - Audi Volkswagen

Get faster coolant circulation through the radiator for cooler running. affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
034Motorsport - Corporate Logo
ES#:
4858162
Mfg#:
034-102-7005
In Stock
$51.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement
ES#1498 - 075121113D 80D - Thermostat - 80C - Includes sealing O-Ring - Mahle-Behr - Audi Volkswagen Porsche

Includes sealing O-Ring affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Lower temperature thermostat, stock is 87�C

Brand:
Mahle-Behr - Corporate Logo
ES#:
1498
Mfg#:
075121113D 80D
In Stock at Vendor
$40.55

This product was last offered at the strikethrough price on
02-19-2026

$36.89 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement
ES#2598454 - 078121113F - Thermostat - 87C - Prevent overheating and premature engine wear - Vaico - Audi Volkswagen

Prevent overheating and premature engine wear affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
We Price Match - Give Us A Call or Chat!
Up to VIN 8D-X-315000, split is in the 1999 model year

Brand:
Vaico - Corporate Logo
ES#:
2598454
Mfg#:
078121113F
In Stock
$16.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement
ES#2764806 - MMTSVR693L -  VR6 Racing Thermostat - 71C - Keep your engine running cooler for more power - Mishimoto - Audi Volkswagen

Keep your engine running cooler for more power affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Lower temperature thermostat than factory - OE is 87°C

Brand:
Mishimoto - Corporate Logo
ES#:
2764806
Mfg#:
MMTSVR693L
In Stock at Vendor
$68.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement
ES#1848432 - N90136802 - Thermostat O-Ring - Ensure a proper seal when installing your new thermostat - Genuine Volkswagen Audi - Audi Volkswagen

Ensure a proper seal when installing your new thermostat affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
1848432
Mfg#:
N90136802
In Stock
10% off MSRP

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

$7.80

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

$7.02 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement
ES#282068 - 075121113D -  Thermostat - 80C - Does not include sealing O-Ring - Genuine Volkswagen Audi - Audi Volkswagen

Does not include sealing O-Ring affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Lower temperature thermostat, stock is 87°C

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
282068
Mfg#:
075121113D
Ships in 1-2 days
7% off MSRP

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

$59.99

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

$55.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement
ES#4858161 - 034-102-7001 - Low Temp Thermostat - 80 Degree C - Get faster coolant circulation through the radiator for cooler running. - 034Motorsport - Audi Volkswagen

Get faster coolant circulation through the radiator for cooler running. affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
034Motorsport - Corporate Logo
ES#:
4858161
Mfg#:
034-102-7001
Back Ordered
$51.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement
ES#1306802 - 050121113C - Thermostat (87C) - Prevent overheating and premature engine wear. Includes O-ring - Vemo - Audi Volkswagen

Prevent overheating and premature engine wear. Includes O-ring affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
Vemo - Corporate Logo
ES#:
1306802
Mfg#:
050121113C
In Stock
ON SALE! SAVE 38%
$18.99

This product was last offered at the strikethrough price on
05-14-2026

$11.74 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement
ES#2802451 - N90380002 - O-Ring - Priced Each (24x3) - O-ring used in various areas on your European vehicle - Rein - Audi

O-ring used in various areas on your European vehicle affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
We Price Match - Give Us A Call or Chat!
24x3 O-ring that is seated between the hard coolant pipe and thermostat housing

Brand:
Rein - Corporate Logo
ES#:
2802451
Mfg#:
N90380002
In Stock
$6.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement
ES#3618081 - 078121121J - Thermostat Housing  - Located on the front right of the engine block - URO - Audi Volkswagen

Located on the front right of the engine block 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#:
3618081
Mfg#:
078121121J
Ships in 1 Business Day
$170.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement
ES#11800 - N90136802 - Thermostat O-Ring - Ensure a proper seal when installing your new thermostat - Febi - Audi BMW Volkswagen

Ensure a proper seal when installing your new thermostat 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#:
11800
Mfg#:
N90136802
In Stock
$1.59 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

More About Engine Thermostat Parts

Your thermostat helps regulate engine temperatures by allowing the coolant to circulate through the radiator once it opens. If it fails, this might mean it never closes, but worst case, it could mean your coolant doesn't get to the radiator. Stay ahead of cooling issues by replacing your thermostat regularly with an OEM thermostat or quality aftermarket thermostat from our selection.

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

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