The thermostat limits the flow of coolant through the engine, helping the engine to reach operating temperature. After thousands of heat cycles, the plastic in these units will disintegrate, leading to cracked and leaking housings. The thermostat itself can also often become stuck in one position, resulting in the engine overheating or running too cool. This relatively inexpensive item should be on everyone’s list of items to replace every few years to maintain optimum performance. This thermostat from Wahler can be sold at a fraction of the dealership cost without compromising on the quality. Comes complete with rubber housing gasket installed.

OEM Part Number: 11531437040
Alternative Part Number: 11537509227
Alternative Part Number: 11530139877
Wahler Part Number: 4326.97D
Mahle Part Number: TM 13 97