Motorad 785-212 Engine Coolant Thermostat Housing Assembly

Integrated thermostat housing for Mercedes-Benz cooling systems

The Motorad 785-212 is an engine coolant thermostat housing assembly built for Mercedes-Benz applications that require a 212°F opening temperature. It combines the thermostat, housing, sensor, seal, and spring clip in an OE-style integrated design for direct replacement service on select C43 AMG, GLC43 AMG, E-Class, GLE, GLS, SL, and related models.

Motorad’s Integrated Housing Thermostat line focuses on OE-spec fit and temperature control for modern cooling systems. This part number, 785-212, uses OEM-quality materials and manufacturing processes to deliver consistent coolant regulation in demanding Mercedes-Benz engine bays.

Key features

• Integrated thermostat housing assembly for select Mercedes-Benz vehicles
• 212°F start-to-open temperature for OE-specified cooling control
• Black housing with plastic, stainless steel, and copper construction
• Rubber gasket/seal included for service replacement
• 3 bolt holes and 3 outlet ports
• No bleeder hole and no jiggle pin
• Outlet diameters: 1.01 in, 1.73 in, and 2.05 in

Detailed description

The Motorad 785-212 thermostat housing assembly is engineered for Mercedes-Benz cooling systems that rely on an integrated thermostat design. Its copper case and wax compound support quick response to coolant temperature changes, helping the engine reach and maintain the correct operating range. This makes it a direct-fit choice for Mercedes-Benz C43 AMG, GLC43 AMG, E450, GLE350, GLE400, GLS450, S450, SL450, and other listed applications.

This part cross-references Gates 78512 and Wix 57852 for the same application. If you are replacing a Mercedes-Benz thermostat housing assembly on a 2017-2021 C43 AMG or a 2016-2019 GLE350, 785-212 matches the OE-style integrated layout and 212°F specification.

Common repair symptoms

• Coolant temperature running outside normal range
• Thermostat housing leaks at the seal or mating surface
• Check engine light related to coolant temperature control
• Slow warm-up or unstable operating temperature
• Cracked or aging plastic housing on Mercedes-Benz cooling systems

Installation notes and tips

Verify the vehicle’s engine code and thermostat temperature specification before installation. This assembly includes the thermostat, housing, sensor, seal, and spring clip as listed in the fitment notes, and it uses a 3-bolt mounting pattern. Clean the sealing surfaces thoroughly and inspect adjacent coolant hoses and connectors before reassembly. For Mercedes-Benz E400, GLE400, and SLK350 applications, confirm the OE-specified 212°F requirement before replacing the original housing.

Quality assurance

Motorad manufactures this integrated housing thermostat with OEM-quality materials and OE-supplier standards. It is produced to OEM specifications and processes for dependable fit and temperature control in demanding automotive cooling systems.