Dorman 902-5155 Engine Coolant Thermostat Housing Assembly - Water Pump

Overview of Dorman Engine Coolant Thermostat Housing Assembly

The Dorman 902-5155 Engine Coolant Thermostat Housing Assembly is designed for reliable cooling system performance in select BMW models. This assembly includes a thermostat and housing engineered to maintain optimal engine temperature and improve coolant flow.

• Material: Durable black plastic construction
• Includes thermostat with 217°F opening temperature
• Comes with a standard gasket for secure sealing
• Features three outlet ports and two mounting holes
• Compatible with BMW 135i, 135is, 335i, 335i xDrive, X1, X5, and X6 models

Detailed Product Description

The Dorman 902-5155 thermostat housing assembly is crafted from high-quality plastic to resist corrosion and withstand engine heat. It features a black finish and includes a thermostat calibrated to open at 217 degrees Fahrenheit, ensuring precise temperature regulation. The assembly comes with a standard gasket to prevent leaks and has two mounting holes with bolt hole center distances ranging from 3.18 to 3.42 inches, accommodating exact fitment requirements. The flange dimensions vary slightly to match OEM specifications, with thickness between 0.125 and 0.17 inches and widths from 1.05 to 1.6 inches. This part does not include mounting hardware but provides three outlet ports for efficient coolant flow.

Compatible Vehicles and Applications

This thermostat housing assembly is compatible with a range of BMW vehicles, including the 135i, 135is, 335i, 335i xDrive, X1, X5, and X6 models. It is designed to replace the original thermostat housing and thermostat, restoring proper engine cooling system function and preventing overheating or inefficient temperature control.

• Prevents engine overheating by regulating coolant flow
• Eliminates coolant leaks caused by damaged housing or seals
• Restores proper thermostat operation for consistent engine temperature
• Addresses issues related to faulty thermostat housing cracks or warping
• Improves engine performance by maintaining optimal operating temperature

Installation Notes and Tips

Installation requires removal of the old thermostat housing and thermostat. Ensure the engine is cool before beginning work to avoid injury. Clean the mounting surface thoroughly before installing the new gasket and housing assembly. Torque mounting bolts to manufacturer specifications to prevent leaks. Note that mounting hardware is not included, so original bolts should be reused or replaced as needed. Verify proper thermostat operation after installation by monitoring engine temperature during initial startup.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit, form, and function. The 902-5155 thermostat housing assembly includes a thermostat and gasket to ensure a complete replacement solution. While specific warranty details are not provided here, Dorman typically offers limited warranties covering defects in material and workmanship. Refer to Dorman’s official documentation for exact warranty terms.