Dorman 902-5173 Engine Coolant Thermostat Housing Assembly

Overview of Dorman Engine Coolant Thermostat Housing Assembly

The Dorman 902-5173 Engine Coolant Thermostat Housing Assembly is designed for precise temperature regulation in select BMW models. This assembly includes a thermostat and sensor, ensuring efficient engine cooling and optimal performance.

• Material: Durable black plastic construction
• Includes thermostat with 217°F opening temperature
• Comes with one thermostat housing, one thermostat, and one sensor
• Flange dimensions: 1.499 inches length, 0.762 inches width, 0.39 inches thickness
• One outlet port and one mounting hole for secure installation
• Standard gasket type included (gasket or seal not included)
• Compatible with multiple BMW models including 535i, 640i xDrive, and 740i

Detailed Product Description

The Dorman 902-5173 thermostat housing assembly is engineered from high-quality plastic to resist corrosion and withstand engine heat cycles. It features multiple inside diameters (0.625, 0.816, and 1.263 inches) to accommodate coolant flow requirements. The assembly includes a thermostat calibrated to open at 217 degrees Fahrenheit, helping maintain optimal engine temperature. The single outlet port and mounting hole simplify installation, while the flange dimensions ensure a proper fit. This assembly is designed specifically for BMW vehicles such as the 535i, 535i GT, 640i xDrive, and 740i, providing reliable cooling system performance.

Compatible BMW Models and Applications

• BMW 535i and 535i xDrive
• BMW 535i GT and 535i GT xDrive
• BMW 640i xDrive and 640i xDrive Gran Coupe
• BMW 740i and ActiveHybrid 5

Common Issues Addressed by This Thermostat Housing Assembly

• Engine overheating due to faulty thermostat operation
• Coolant leaks from damaged or cracked thermostat housing
• Inaccurate temperature regulation causing poor engine performance
• Sensor failure affecting engine temperature readings
• Corrosion or wear in original housing compromising coolant flow

Installation Notes and Tips

Installation requires removal of the old thermostat housing and careful cleaning of the mounting surface. Note that mounting hardware and gasket or seal are not included and should be sourced separately. Ensure the thermostat opening temperature matches vehicle specifications (217°F). Proper torque on the single mounting bolt is essential to prevent leaks. Verify sensor connections are secure for accurate temperature monitoring.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit and function. The 902-5173 thermostat housing assembly undergoes rigorous quality control to ensure durability and reliable operation. While specific warranty details vary, Dorman typically offers limited warranties covering defects in material and workmanship.