Motorad 5541KT Engine Coolant Thermostat Housing Assembly

Engine Cooling Thermostat Housing Kit

The Motorad 5541KT engine coolant thermostat housing assembly is built for BMW cooling systems that need accurate temperature control and a secure seal at the thermostat housing. This kit is specified at 192F and includes the housing, thermostat, and seal for direct service on listed BMW applications.

Motorad Kit products are OE-supplier sourced and manufactured to OEM specifications and processes, using materials selected for cooling-system durability and consistent thermal response. The copper case and wax compound support quick reaction to coolant temperature changes, while the offset design, air relief valve, and OEM-style seals are included where applicable.

Key Features

• Engine coolant thermostat housing assembly for BMW cooling system service
• OE specified 192F thermostat temperature
• Includes housing, thermostat, and seal
• Copper case and wax compound for responsive temperature regulation
• Offset design with air relief valve and OEM-style seals where applicable
• Steel, stainless steel, copper, and rubber construction
• Silver finish with 4 bolt holes

Detailed Description

Motorad 5541KT is a thermostat housing assembly designed for BMW models including the 1992-1995 BMW 325i, 1992-1993 BMW 325is, 1993-1995 BMW 525i, 1994-1999 BMW M3, 1996-1998 BMW 328i, 1996-1999 BMW 328is, 1997-2000 BMW Z3, 1998-1999 BMW 323is, 1998 BMW 323i, and 1999 BMW 323ti. This part number 5541KT is built to OE specifications for fit and thermal performance in the listed applications.

This part cross-references 95541KT and NI for the same application. For BMW 3 Series and Z3 cooling system repairs, the 5541KT provides a direct replacement solution where the thermostat housing assembly is serviced as a unit.

Common Problems This Part Can Address

• Coolant temperature regulation issues caused by a worn thermostat
• Leaks at the thermostat housing or seal interface
• Delayed engine warm-up from a thermostat that no longer opens at the specified temperature
• Cooling system service needs on BMW M3, 3 Series, 5 Series, and Z3 applications
• Housing wear or corrosion in the thermostat assembly area

Installation Notes and Tips

Verify the OE specified 192F application before installation. Inspect the mating surfaces, coolant passages, and surrounding hoses for wear or contamination before reassembly. Use the correct torque sequence for the 4-bolt housing and refill the cooling system according to BMW service procedures to remove trapped air.

Quality Assurance

Motorad manufactures this Kit line product with OEM quality materials and safety standards as an OE supplier, using OEM specifications and processes for cooling-system service.