Motorad 469-203 Engine Coolant Thermostat Housing Assembly

Integrated Thermostat Housing for BMW Cooling Systems

Motorad 469-203 is an integrated engine coolant thermostat housing assembly built for OE-style cooling system service. It combines the thermostat, housing, and seal in one unit for BMW applications that require a 203°F opening temperature and a direct replacement layout.

Fits 1996-2000 BMW Z3, N/A. Fits 1996-1999 BMW 318i, N/A. Fits 1996-1999 BMW 318is, N/A. Fits 1996-1999 BMW 318ti, N/A.

Key Features

• Integrated housing thermostat assembly for simplified replacement
• 203°F start-to-open temperature for OE-specified cooling control
• Plastic, stainless steel, and copper construction
• Rubber gasket/seal included
• 4 bolt holes and 2 outlet ports
• Silver finish
• Offset design with air relief valve where applicable
• Copper case and wax compound for responsive temperature changes

Product Details

The Motorad Integrated Housing Thermostat line is built to OE specifications and processes for vehicles that rely on precise coolant regulation. Part number 469-203 uses an integrated housing design with OEM-style sealing surfaces and a 203°F thermostat rating, making it a direct service part for BMW Z3, BMW 318i, BMW 318is, and BMW 318ti cooling system maintenance. This part cross-references Dorman - OE Solutions 902-5118 for the same application.

Common Cooling System Issues It Can Address

• Engine running cooler or hotter than specified due to thermostat wear
• Coolant leaks at the thermostat housing or seal interface
• Delayed coolant flow control from a sticking thermostat
• Temperature fluctuation caused by aging housing materials
• Service concerns when replacing a thermostat and housing together

Installation Notes

Verify the 203°F temperature rating and match the outlet port layout before installation. Inspect the mating surfaces, replace the seal with the included rubber gasket/seal, and confirm the cooling system is properly bled after service. Motorad 469-203 uses 4 bolt holes and does not include bolts or mounting hardware.

Quality Assurance

Manufactured by an OE supplier using OEM-quality materials and safety standards, this thermostat housing assembly is produced to meet OE specifications for demanding cooling system use. The copper case and wax compound are selected for fast response to coolant temperature changes, supporting consistent thermal control in the listed BMW applications.