Strange coolant leak? It's possible you just need to upgrade your J-plug!
Audi A4 Engine Thermostat Parts
Rubber coolant hose that connects thermostat to coolant hard pipe
10X Entries Into Our F80 M3 Sweepstakes
Ensure a proper seal when installing your new thermostat
We Price Match - Give Us A Call or Chat!
Prevent overheating and premature engine wear with a lower opening temperature
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
This product was last offered at the strikethrough price on
08-31-2026
Keep your cooling system efficient
For vehicles up to production date 6/3/2012
This product was last offered at the strikethrough price on
05-02-2026
Includes housing, gasket & sensor
We Price Match - Give Us A Call or Chat!
This product was last offered at the strikethrough price on
09-03-2026
Includes sealing O-Ring
From VIN 8D-X-315001, split is in the 1999 model year
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
This product was last offered at the strikethrough price on
09-09-2026
Install new hardware with your new parts. M6x22
Engine codes AEB & ATW. Secures the thermostat housing to the water pump
Located on the water pump assembly
We Price Match - Give Us A Call or Chat!
Maintain proper operating temperature with a new thermostat, housing and hardware
This product was last offered at the strikethrough price on
07-26-2026
Install new hardware with your new parts. M8x20
Securing bolt for the coolant "J" plug that is on the block.
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
This product was last offered at the strikethrough price on
06-26-2026
Get faster coolant circulation through the radiator for cooler running.
2X Entries Into Our F80 M3 Sweepstakes
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!
This product was last offered at the strikethrough price on
08-31-2026
Located between main coolant flange hard pipe and thermostat housing
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
This product was last offered at the strikethrough price on
08-31-2026
Located on the left side of the engine block
10X Entries Into Our F80 M3 Sweepstakes
Spring band clamp used in various areas on your European vehicle
Secures rubber coolant hose to thermostat
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
This product was last offered at the strikethrough price on
09-09-2026