Motorad 691-190 Engine Coolant Thermostat Housing Assembly

Integrated Thermostat Housing for BMW Cooling Systems

Motorad 691-190 is an engine coolant thermostat housing assembly built for OE-style cooling system service. It combines the thermostat, housing, and seal in one integrated unit for 190°F operation, making it a direct replacement choice for BMW X5 and BMW 335d applications that require the specified opening temperature.

The Motorad Integrated Housing Thermostat line focuses on OE-spec fit and materials for modern cooling systems. This 691-190 assembly uses a plastic, stainless steel, and copper construction with a rubber seal, plus an offset design and air relief valve where applicable to support proper coolant flow and temperature control.

Key Features

• Part number: 691-190
• Integrated engine coolant thermostat housing assembly
• 190°F opening temperature
• Includes thermostat, housing, and seal
• Rubber gasket/seal included
• 4 bolt holes and 2 outlet ports
• Black housing finish
• Material construction: plastic, stainless steel, and copper
• OE-specification manufacturing and processes

Detailed Description

Motorad 691-190 is engineered as an OE-style thermostat housing assembly for vehicles that use an integrated housing design. The copper case and wax compound are used to respond quickly to coolant temperature changes, helping the cooling system regulate engine temperature at the specified 190°F start-to-open point. This part cross-references Bosch 15309 for the same application. It is a direct service option for BMW X5 and BMW 335d cooling system repairs where the original thermostat housing assembly has worn, cracked, or begun to regulate temperature inconsistently.

Compatible With 2009-2013 BMW X5, N/A, and 2009-2011 BMW 335d, N/A. Motorad 691-190 is also referenced by part numbers 69190, 9691190, HT190-196, P69190, and TI23488.

Common Cooling System Issues This Part Can Address

• Engine running too cool or too warm due to thermostat regulation problems
• Coolant leaks from a worn housing or seal
• Temperature fluctuation caused by a failing integrated thermostat assembly
• Cracked or aged plastic housing on BMW cooling systems
• Improper coolant flow control at the specified 190°F operating point

Installation Notes and Tips

Verify the OE-specified temperature and outlet configuration before installation. Inspect the mating surfaces, replace damaged hoses or clamps as needed, and confirm the rubber seal seats evenly during assembly. Because this unit uses an integrated housing design, proper alignment of the 4 bolt holes and outlet ports is important for leak-free installation.

Quality Assurance

Manufactured by an OE supplier using OEM-quality materials and production processes, this thermostat housing assembly is built to meet the demands of automotive cooling systems. Motorad’s Integrated Housing Thermostat line is intended to match OE specifications for fit and temperature control.