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Audi B6 A4 Quattro 1.8T

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Audi B6 A4 Quattro 1.8T Engine Thermostat Parts

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Spring Clamp - Priced Each

ES#259720 - n90687101 - Spring Clamp - Priced Each - Install new hardware with your new parts. 32x12 - Genuine Volkswagen Audi - Audi Volkswagen

Install new hardware with your new parts. 32x12

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
259720
Mfg#:
N90687101
In Stock
$10.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Thermostat Assembly (06B121111K)

ES#2813041 - 06B121111K - Thermostat Assembly (06B121111K) - Includes housing, gasket & sensor - Hamburg Tech - Audi

Includes housing, gasket & sensor We Price Match - Give Us A Call or Chat!

Brand:
Hamburg Tech - Corporate Logo
ES#:
2813041
Mfg#:
06B121111K
Ships in 2 Business Days
$69.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Thermostat Housing J-Plug - Billet Aluminum

Strange coolant leak? It's possible you just need to upgrade your J-plug!

Brand:
40T Performance - Corporate Logo
ES#:
4818842
Mfg#:
1.8TJPLUG
Ships in 6 Business Days
$45.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Hex Bolt - Priced Each

ES#467337 - N10063205 - Hex Bolt - Priced Each - Install new hardware with your new parts. M8x20 - Genuine Volkswagen Audi - Audi

Install new hardware with your new parts. M8x20 Securing bolt for the coolant "J" plug that is on the block.

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
467337
Mfg#:
N10063205
In Stock
3% off MSRP

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

$4.86

This product was last offered at the strikethrough price on
06-26-2026

$4.72 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Sealing O-Ring - Priced Each

ES#2801566 - WHT006407 - Sealing O-Ring - Priced Each - Install a new o-ring for a proper seal. 20x3 - Rein - Audi Volkswagen

Install a new o-ring for a proper seal. 20x3 2X Entries For Our 25th Anniversary Sweepstakes!
We Price Match - Give Us A Call or Chat!
O-Ring for the faulty coolant "J-Plug" that is located next to the thermostat.

Brand:
Rein - Corporate Logo
ES#:
2801566
Mfg#:
WHT006407
In Stock at Vendor
$6.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Coolant "J" Plug

ES#4415624 - 06B103033A - Coolant "J" Plug - Located on the block near the coolant regulator - URO - Audi

Located on the block near the coolant regulator 2X Entries For Our 25th Anniversary Sweepstakes!
We Price Match - Give Us A Call or Chat!

Brand:
URO - Corporate Logo
ES#:
4415624
Mfg#:
06B103033A
Ships in 2 Business Days
$17.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Thermostat Assembly

Includes housing, gasket & sensor

Brand:
CoolXPert
ES#:
4070682
Mfg#:
06B121111K
Back Ordered
$83.99

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

$81.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Coolant Hose

ES#4818465 - 06F121057D - Coolant Hose - Rubber coolant hose that connects thermostat to coolant hard pipe - Bremmen Parts - Audi

Rubber coolant hose that connects thermostat to coolant hard pipe 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
Bremmen Parts - Corporate Logo
ES#:
4818465
Mfg#:
06F121057D
In Stock
ON SALE! SAVE 35%
$4.99

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

$3.26 USD
Free Shipping
on orders $49 and up

Coolant Hose

ES#2803054 - 06F121057D - Coolant Hose - Rubber coolant hose that connects thermostat to coolant hard pipe - Rein - Audi

Rubber coolant hose that connects thermostat to coolant hard pipe 2X Entries For Our 25th Anniversary Sweepstakes!
We Price Match - Give Us A Call or Chat!

Brand:
Rein - Corporate Logo
ES#:
2803054
Mfg#:
06F121057D
Ships in 2 Business Days
$4.07 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Thermostat O-Ring

ES#2834711 - 06B121119B - Thermostat O-Ring - Ensure a proper seal when installing your new thermostat. 50x3.5mm - Meistersatz - Audi Volkswagen

Ensure a proper seal when installing your new thermostat. 50x3.5mm

Brand:
Meistersatz - Corporate Logo
ES#:
2834711
Mfg#:
06B121119B
In Stock
$3.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Coolant "J" Plug

ES#3139061 - 06B103033A - Coolant "J" Plug - Located on the block near the coolant regulator - Hudson - Audi

Located on the block near the coolant regulator

Brand:
Hudson - Corporate Logo
ES#:
3139061
Mfg#:
06B103033A
Ships in 1-2 days
$15.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

VW | Radiator Hose

ES#4859654 - 06F121057D - VW | Radiator Hose - Vaico - Audi

We Price Match - Give Us A Call or Chat!

Brand:
Vaico - Corporate Logo
ES#:
4859654
Mfg#:
06F121057D
In Stock at Vendor
$9.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Thermostat Assembly

ES#3190049 - 902-814 - Thermostat Assembly - Includes housing, gasket & sensor - Dorman - Audi

Includes housing, gasket & sensor

Brand:
Dorman - Corporate Logo
ES#:
3190049
Mfg#:
902-814
Ships in 4 Business Days
$109.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

THERMOSTAT ASSEMBLY 100C

ES#4151133 - 06B121111K - THERMOSTAT ASSEMBLY 100C - Rein - Audi

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

Brand:
Rein - Corporate Logo
ES#:
4151133
Mfg#:
06B121111K
Ships in 4 Business Days
$111.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Thermostat Assembly

Includes housing, gasket & sensor

Brand:
Gates - Corporate Logo
ES#:
3234796
Mfg#:
06B121111K
Ships on Aug 31, 2026
$96.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Thermostat O-Ring

Ensure a proper seal when installing your new thermostat. 50x3.5mm 2X Entries For Our 25th Anniversary Sweepstakes!

Brand:
Elring - Corporate Logo
ES#:
5340952
Mfg#:
06B121119B
Special Order: No Guaranteed ETA
$4.99 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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