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Audi A4 Engine Thermostat Parts

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Thermostat/Water Pump Kit

ES#4039367 - 06L121111H - Thermostat/Water Pump Kit - Includes thermostat, water pump, gasket, and belt. Made in Germany! - Vemo - Audi Volkswagen

Includes thermostat, water pump, gasket, and belt. Made in Germany!

Brand:
Vemo - Corporate Logo
ES#:
4039367
Mfg#:
06L121111H
Ships on Nov 17, 2026
ON SALE!
$376.99

This product was last offered at the strikethrough price on
07-14-2026

$365.68 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Thermostat Replacement Kit

ES#2574945 - 06B121111KKT - Thermostat Replacement Kit - Includes new thermostat, j-plug, o-ring, and hardware - Assembled By ECS - Audi

Includes new thermostat, j-plug, o-ring, and hardware 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
Assembled By ECS - Corporate Logo
ES#:
2574945
Mfg#:
06B121111KKT
In Stock
ON SALE! SAVE 19%
$116.99

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

$94.55 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Thermostat / Water Pump Replacement Kit

ES#5386442 - 06L121111HPKT3 - Thermostat / Water Pump Replacement Kit - Includes necessary parts to replace the thermostat. Includes revised genuine water pump/thermostat. - Genuine Volkswagen Audi - Audi Volkswagen

Includes necessary parts to replace the thermostat. Includes revised genuine water pump/thermostat.

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
5386442
Mfg#:
06L121111HPKT3
Ships in 2 Business Days
$809.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Partial Replacement

Thermostat / Water Pump Replacement Kit

ES#5386432 - 06L121111HPKT2 - Thermostat / Water Pump Replacement Kit - Includes necessary parts to replace the thermostat. Includes upgraded Hamburg Technic water pump/thermostat. - Assembled By ECS - Audi Volkswagen

Includes necessary parts to replace the thermostat. Includes upgraded Hamburg Technic water pump/thermostat. 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
Assembled By ECS - Corporate Logo
ES#:
5386432
Mfg#:
06L121111HPKT2
In Stock
ON SALE!
$312.99

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

$312.27 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Partial Replacement

Aluminum Water Pump Module (06H121026DD)

ES#4362074 - 06H121026DD - Aluminum Water Pump Module (06H121026DD) - Complete water pump housing module, includes thermostat, temp sensor, belt and gasket - Featuring a full aluminum housing! - Rein - Audi Volkswagen

Complete water pump housing module, includes thermostat, temp sensor, belt and gasket - Featuring a full aluminum housing! 2X Entries For Our 25th Anniversary Sweepstakes!
We Price Match - Give Us A Call or Chat!

Brand:
Rein - Corporate Logo
ES#:
4362074
Mfg#:
06H121026DD
Back Ordered
Auto Notify
$477.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Bolt - Priced Each

ES#261191 - N90735604 - Bolt - Priced Each - Install new hardware with your new parts. M7x28 - Genuine Volkswagen Audi - Audi Volkswagen

Install new hardware with your new parts. M7x28 Secures thermostat housing to engine block - 2 needed total

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
261191
Mfg#:
N90735604
In Stock
2% off MSRP

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

$4.18

This product was last offered at the strikethrough price on
07-24-2026

$4.09 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 For Our 25th Anniversary Sweepstakes!

Brand:
Bremmen Parts - Corporate Logo
ES#:
4766153
Mfg#:
050121113C
In Stock
ON SALE!
$16.99

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

$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 For Our 25th Anniversary 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

Thermostat Assembly

ES#2804445 - 06D121111G - Thermostat Assembly - Includes sealing o-ring - Bremmen Parts - Audi

Includes sealing o-ring 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
Bremmen Parts - Corporate Logo
ES#:
2804445
Mfg#:
06D121111G
In Stock
ON SALE! SAVE 20%
$47.99

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

$38.34 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Billet Aluminum Coolant J-Plug W/ O-ring (06B103033A)

ES#2763232 - 005224ECS01A - Billet Aluminum Coolant J-Plug W/ O-ring (06B103033A) - Engineered to be the last worry in your coolant system - ECS - Audi

Engineered to be the last worry in your coolant system 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
ECS - Corporate Logo
ES#:
2763232
Mfg#:
005224ECS01A
In Stock
ON SALE! SAVE 25%
$66.99

This product was last offered at the strikethrough price on
06-13-2026

$50.24 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Torx Bolt - Priced Each

ES#467607 - N10196103 - Torx Bolt - Priced Each - Install new hardware with your new parts. M6x18 - Genuine Volkswagen Audi - Audi Volkswagen

Install new hardware with your new parts. M6x18 Used to secure the thermostat housing to the water pump

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
467607
Mfg#:
N10196103
In Stock
$3.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Thermostat - 87C

ES#1892327 - 078121113F - Thermostat - 87C - Prevent overheating and premature engine wear - Mahle-Behr - Audi Volkswagen

Prevent overheating and premature engine wear 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

Thermostat Replacement Kit

ES#2586519 - 06D121111G2KT - Thermostat Replacement Kit - Includes thermostat with housing, o-ring and mounting hardware - Assembled By ECS - Audi

Includes thermostat with housing, o-ring and mounting hardware 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
Assembled By ECS - Corporate Logo
ES#:
2586519
Mfg#:
06D121111G2KT
In Stock
ON SALE! SAVE 25%
$56.99

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

$42.88 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
In Stock
$68.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Thermostat Replacement Kit

ES#2586522 - 06D121111G1KT - Thermostat Replacement Kit - Includes thermostat with housing, o-ring and mounting hardware - Genuine Volkswagen Audi - Audi

Includes thermostat with housing, o-ring and mounting hardware

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
2586522
Mfg#:
06D121111G1KT
In Stock
$136.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Torx Bolt - Priced Each

ES#471805 - N91068001 - Torx Bolt - Priced Each - Install new hardware with your new parts. M6x28 - Genuine Volkswagen Audi - Audi

Install new hardware with your new parts. M6x28 Secures the thermostat assembly to the engine

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
471805
Mfg#:
N91068001
In Stock
$1.99 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.

Let us help you find the parts that fit your Audi

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