Dorman 902-817 Engine Coolant Thermostat Housing Assembly - Water Pump

Overview of Dorman Engine Coolant Thermostat Housing Assembly

The Dorman 902-817 Engine Coolant Thermostat Housing Assembly is designed for reliable cooling system performance in various BMW models. Constructed from durable aluminum with a natural finish, this thermostat housing assembly ensures proper engine temperature regulation and efficient coolant flow.

• Material: Aluminum for corrosion resistance and durability
• Includes thermostat with 221°F opening temperature
• Gasket included for secure sealing
• Designed with one outlet port and three mounting holes
• Compatible with multiple BMW models including 5 Series, 6 Series, 7 Series, M Series, and X Series

Detailed Product Description

This Dorman thermostat housing assembly (part number 902-817) features a natural aluminum construction that offers strength and resistance to heat and corrosion. The assembly includes a thermostat calibrated to open at 221 degrees Fahrenheit, helping maintain optimal engine operating temperature. The housing has a flange measuring approximately 3.54 inches in length, 3.55 inches in width, and 0.438 inches in thickness, with three mounting holes spaced around 3.1 to 3.13 inches apart center-to-center. A gasket is included to ensure a tight seal and prevent coolant leaks. This assembly does not include mounting hardware but comes with one sensor to support engine temperature monitoring.

Compatible BMW Models

This thermostat housing assembly is compatible with a wide range of BMW vehicles, including but not limited to:

• BMW 525i, 528i, 530i, 535i, 535i GT
• BMW 545i, 550i, 550i GT, 550i GT xDrive, 550i xDrive
• BMW 645Ci, 650Ci, 650i, 650i Gran Coupe, 650i xDrive, 650i xDrive Gran Coupe
• BMW 740i, 745i, 745Li, 750i, 750i xDrive, 750Li, 750Li xDrive
• BMW 760i, 760Li, M2, M3, M4, M5, M6, M6 Gran Coupe, M8, M8 Gran Coupe
• BMW M760i xDrive, M760Li xDrive, X3, X4, X5, X6

Common Applications and Issues Addressed

• Replacement for cracked or leaking thermostat housing
• Restores proper coolant flow and engine temperature regulation
• Prevents engine overheating due to thermostat failure
• Eliminates coolant leaks caused by worn gaskets or seals
• Supports accurate temperature sensor readings for engine management

Installation Notes and Tips

• Verify compatibility with your specific BMW model before installation
• Use the included gasket to ensure a proper seal and prevent leaks
• Torque mounting bolts to manufacturer specifications (mounting hardware not included)
• Inspect coolant hoses and connections during installation for wear or damage
• Bleeder hole is not included; ensure proper coolant system bleeding after installation

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit, form, and function. The 902-817 thermostat housing assembly undergoes quality checks to ensure durability and reliable performance. This product includes a gasket and thermostat to provide a complete solution for your cooling system needs. Warranty details are provided by Dorman and typically cover defects in material and workmanship under normal use.