Motorad 935-189 Engine Coolant Thermostat Housing Assembly

Integrated Housing Thermostat for Volkswagen Passat

Motorad 935-189 is an engine coolant thermostat housing assembly built for OE-specified cooling performance. It combines the thermostat, housing, and seal in one integrated design for 2012-2014 Volkswagen Passat applications with a 189°F opening temperature.

The Motorad Integrated Housing Thermostat line focuses on OE-style fit and temperature control. This 935-189 assembly uses OEM specifications and processes, with a copper case and wax compound for quick response to coolant temperature changes.

Key Features

• Fits 2012-2014 Volkswagen Passat
• Engine coolant thermostat housing assembly with integrated thermostat and housing
• 189°F start-to-open temperature
• Black housing with plastic, stainless steel, and copper construction
• Rubber seal included
• 2 bolt holes and 4 outlet ports
• Offset design with air relief valve where applicable
• OE supplier manufacturing with OEM quality materials and safety standards

Detailed Description

Motorad 935-189 is a direct-fit thermostat housing assembly for the Volkswagen Passat cooling system. It is manufactured to OE specifications and uses a copper case with wax compound to react quickly to coolant temperature changes, helping the engine reach and maintain proper operating temperature. The integrated housing design and OEM-style seals support a clean replacement for the original coolant outlet assembly.

This part cross-references Genuine 03L121111Q for the same application. Motorad 935-189 is a practical choice when replacing a worn thermostat housing on a 2012-2014 Volkswagen Passat, especially when the original housing, thermostat, or seal shows signs of age.

Common Issues This Part Can Address

• Coolant temperature that stays too low or takes too long to warm up
• Thermostat sticking open or closed
• Coolant seepage at the housing seal
• Cracked or aging thermostat housing components
• Temperature control problems in the Volkswagen Passat cooling system

Installation Notes and Tips

Verify the 189°F temperature specification before installation and confirm the outlet port layout matches the original part. Inspect the mating surfaces, replace damaged hoses or clamps as needed, and follow the vehicle service procedure for coolant refill and air bleeding. This assembly includes a rubber seal; mounting hardware is not included.

Quality Assurance

Motorad manufactures this thermostat housing assembly with OEM quality materials and OE supplier standards. The part is built to meet OEM specifications and processes for dependable cooling-system service on the Volkswagen Passat.