Dorman 902-5135 Engine Coolant Thermostat Housing Assembly - Engine Block

Overview of Dorman Engine Coolant Thermostat Housing Assembly

The Dorman 902-5135 Engine Coolant Thermostat Housing Assembly is designed for precise temperature regulation in BMW vehicles. This assembly integrates a thermostat calibrated to open at 226°F, ensuring optimal engine performance and preventing overheating in models like the BMW 320i and 328i xDrive.

• Durable black plastic construction for corrosion resistance
• Includes thermostat with 226°F opening temperature
• Three outlet ports for efficient coolant flow
• Two mounting holes for secure installation
• Compatible with multiple BMW models including 220i, 428i Gran Coupe, and X5

Detailed Product Features and Specifications

The Dorman 902-5135 thermostat housing assembly is made from high-quality plastic, providing a lightweight yet durable solution for engine cooling systems. Its black finish offers resistance to heat and corrosion, extending the part's service life. The assembly features a flange measuring 1.75 inches in length, 0.5 inches in width, and 0.25 inches in thickness, designed to fit precisely on the engine block. With three outlet ports, this housing facilitates efficient coolant distribution, critical for maintaining consistent engine temperatures. The included thermostat opens at 226 degrees Fahrenheit, a specification tailored to BMW's engine cooling requirements. Note that mounting hardware and gaskets are not included, so ensure these components are available during installation.

Compatible BMW Models and Applications

This thermostat housing assembly is compatible with a wide range of BMW vehicles, including but not limited to the 220i, 228i xDrive, 320i xDrive, 328i GT xDrive, 420i Gran Coupe, 428i xDrive Gran Coupe, 520i, 528i xDrive, X1, X3, X4, X5, and Z4 models. The part number 902-5135 is specifically designed to meet the cooling system requirements of these vehicles, ensuring proper fit and function.

Common Issues Addressed by This Thermostat Housing Assembly

• Engine overheating due to thermostat failure
• Coolant leaks from cracked or damaged housing
• Inconsistent engine temperature regulation
• Reduced engine efficiency caused by faulty coolant flow
• Replacement of worn or corroded thermostat housing components

Installation Notes and Tips

When installing the Dorman 902-5135 thermostat housing assembly, verify that the engine is cool to prevent injury. Since mounting hardware and gaskets are not included, use OEM or compatible parts to ensure a proper seal and secure fit. Clean the mounting surface thoroughly before installation to avoid leaks. Torque mounting bolts to manufacturer specifications and refill the cooling system with the appropriate coolant. Bleeding the system to remove air pockets is recommended for optimal performance.

Quality Assurance and Warranty Information

Dorman parts are engineered to meet or exceed OEM standards for fit, form, and function. The 902-5135 thermostat housing assembly undergoes rigorous quality control to ensure durability and reliable operation in BMW vehicles. While specific warranty details may vary, Dorman typically offers a limited warranty covering defects in material and workmanship. Consult product documentation or the supplier for exact warranty terms.