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Volkswagen Passat B5 FWD 1.8T

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Volkswagen Passat B5 FWD 1.8T Engine Thermostat Parts

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Thermostat Housing (Aluminum)

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 2X Entries Into Our F80 M3 Sweepstakes
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

Thermostat (87°C)

ES#4766153 - 050121113C - Thermostat (87C) - Prevent overheating and premature engine wear. Includes O-ring - Bremmen Parts - Audi Volkswagen

Prevent overheating and premature engine wear. Includes O-ring 10X Entries Into Our F80 M3 Sweepstakes

Brand:
Bremmen Parts - Corporate Logo
ES#:
4766153
Mfg#:
050121113C
Ships on Nov 10, 2026
ON SALE! SAVE 11%
$17.99

This product was last offered at the strikethrough price on
09-14-2026

$15.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Allen/Hex Bolt - Priced Each

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 2X Entries Into Our F80 M3 Sweepstakes
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

Racing Thermostat (82C)

ES#3184176 - MMTS-GTI-99 - Racing Thermostat (82C) - Prevent overheating and premature engine wear with a lower opening temperature - Mishimoto - Audi Volkswagen

Prevent overheating and premature engine wear with a lower opening temperature

Brand:
Mishimoto - Corporate Logo
ES#:
3184176
Mfg#:
MMTS-GTI-99
Ships in 3 Business Days
$68.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Thermostat (87°C)

ES#261231 - 050121113C - Thermostat (87C) - Prevent overheating and premature engine wear - Genuine Volkswagen Audi - Audi Volkswagen

Prevent overheating and premature engine wear

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
261231
Mfg#:
050121113C
In Stock
15% off MSRP

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

$61.99

This product was last offered at the strikethrough price on
10-01-2026

$52.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Thermostat (87°C)

ES#544 - 050121113C - Thermostat (87C) - Prevent overheating and premature engine wear. Includes O-ring - Mahle-Behr - Audi Volkswagen

Prevent overheating and premature engine wear. Includes O-ring

Brand:
Mahle-Behr - Corporate Logo
ES#:
544
Mfg#:
050121113C
In Stock
$24.99

This product was last offered at the strikethrough price on
09-16-2026

$24.63 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Thermostat (87°C)

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

Brand:
Vemo - Corporate Logo
ES#:
1306802
Mfg#:
050121113C
In Stock
$18.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Allen/Hex Bolt - Priced Each

ES#6661 - N90945002 - Allen/Hex Bolt - Priced Each - Install new hardware with your new parts. M7x21.5mm - Genuine Volkswagen Audi - Audi Volkswagen

Install new hardware with your new parts. M7x21.5mm Secures thermostat housing to the block, 2 required.

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
6661
Mfg#:
N90945002
In Stock
Limited Qty Sale
29% off MSRP

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

$8.49

This product was last offered at the strikethrough price on
10-10-2026

$5.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Thermostat O-Ring

ES#261234 - 038121119B - Thermostat O-Ring - Ensure a proper seal when installing your new thermostat. 50x4 - Genuine Volkswagen Audi - Audi Volkswagen

Ensure a proper seal when installing your new thermostat. 50x4

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
261234
Mfg#:
038121119B
In Stock
$7.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Thermostat O-Ring - Priced Each

ES#2865801 - 038121119B - Thermostat O-Ring - Priced Each - Recommended when changing the thermostat - Febi - Audi Volkswagen

Recommended when changing the thermostat We Price Match - Give Us A Call or Chat!

Brand:
Febi - Corporate Logo
ES#:
2865801
Mfg#:
038121119B
In Stock
$5.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Thermostat Housing

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 2X Entries Into Our F80 M3 Sweepstakes
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

Complete Thermostat Replacement Kit

ES#2580973 - 06B121121LKT1 - Complete Thermostat Replacement Kit - Includes a genuine 87C thermostat, housing, o-ring and stretch bolts - Assembled By ECS - Volkswagen

Includes a genuine 87�C thermostat, housing, o-ring and stretch bolts 10X Entries Into Our F80 M3 Sweepstakes
For vehicles with AUG or AWM engine codes only.

Brand:
Assembled By ECS - Corporate Logo
ES#:
2580973
Mfg#:
06B121121LKT1
In Stock
ON SALE! SAVE 24%
$36.99

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

$28.01 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Thermostat Housing

ES#2865688 - 030121121B - Thermostat Housing - Located on the water pump assembly - Febi - Audi Volkswagen

Located on the water pump assembly We Price Match - Give Us A Call or Chat!
For vehicles with AEB or ATW engine codes only.

Brand:
Febi - Corporate Logo
ES#:
2865688
Mfg#:
030121121B
In Stock
$9.22 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Thermostat - 87�C

ES#2894961 - 078121113F - Thermostat - 87C - Prevent overheating and premature engine wear - Vemo - Audi Volkswagen

Prevent overheating and premature engine wear

Brand:
Vemo - Corporate Logo
ES#:
2894961
Mfg#:
078121113F
Ships in 1 Business Day
$29.99

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

$28.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Thermostat (87°C)

ES#3149390 - 050121113C - Thermostat (87C) - Prevent overheating and premature engine wear. Includes O-ring - Rein - Audi Volkswagen

Prevent overheating and premature engine wear. Includes O-ring 2X Entries Into Our F80 M3 Sweepstakes
We Price Match - Give Us A Call or Chat!

Brand:
Rein - Corporate Logo
ES#:
3149390
Mfg#:
050121113C
Ships in 1 Business Day
$20.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Complete Thermostat Replacement Kit

ES#2580967 - 050121113CKT - Complete Thermostat Replacement Kit - Includes a genuine 87C thermostat, housing, o-ring and stretch bolts - Genuine Volkswagen Audi - Volkswagen

Includes a genuine 87�C thermostat, housing, o-ring and stretch bolts For vehicles with AUG or AWM engine codes only.

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
2580967
Mfg#:
050121113CKT
In Stock
$83.99

This product was last offered at the strikethrough price on
10-01-2026

$79.99 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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