Replacement RM31960001 Engine Coolant Thermostat Housing OEM - 11538699290

The Replacement RM31960001 is an OEM-equivalent engine coolant thermostat housing designed for the Mini Cooper (2007–2013) and Mini Cooper Paceman (2013–2015) equipped with the naturally aspirated, non-turbo 1.6L engine. This part directly replaces BMW/Mini OEM part number 11538699290.

The thermostat housing is a critical component of the engine cooling system. It houses the integrated thermostat — a mechanical valve that regulates coolant flow based on engine temperature. When the engine is cold, the thermostat remains closed to allow the engine to reach operating temperature quickly. As the engine heats up, the thermostat opens to circulate coolant and prevent overheating.

Key Features:

• Direct OEM replacement for BMW/Mini part number 11538699290
• Designed for naturally aspirated (non-turbo) base model Cooper engines
• Restores proper coolant flow and engine temperature regulation
• Addresses common failure modes including cracked housings and coolant leaks
• Manufactured to OEM fit and function specifications

Common Symptoms of a Failed Thermostat Housing:

• Visible coolant leaks around the thermostat housing area
• White residue or coolant pooling on top of the transmission
• Low coolant reservoir level requiring frequent top-offs
• Engine overheating or failure to reach normal operating temperature

This replacement thermostat housing is a straightforward repair solution for restoring the integrity of your Mini Cooper's cooling system. When installing, torque the housing bolts to 8 Nm (71 in-lb) and always disconnect the battery before beginning the repair.