Dorman 902-5138 Engine Coolant Thermostat Housing Assembly

Reliable Engine Coolant Thermostat Housing Assembly for Lexus and Toyota

The Dorman 902-5138 Engine Coolant Thermostat Housing Assembly is designed to maintain optimal engine temperature for select Lexus and Toyota models. This assembly includes a thermostat calibrated to open at 180°F, ensuring efficient coolant flow and engine performance.

• Durable black plastic construction for corrosion resistance
• Includes thermostat and gasket for a complete replacement
• Two outlet ports and three mounting holes for secure installation
• Thermostat opens at 180 degrees Fahrenheit for precise temperature control
• Compatible with Lexus and Toyota models including Corolla, CT200h, Prius, Prius AWD-e, Prius Plug-In, Prius Prime, and Prius V

Product Details and Specifications

This engine coolant thermostat housing assembly features a plastic housing with a flange measuring 3.625 inches in length, 2.93 inches in width, and 0.395 inches in thickness. The housing includes two outlet ports and three mounting holes with bolt hole center distances of 2.2 and 3 inches, providing a secure fit. The included thermostat is designed to open at 180°F, allowing coolant to circulate when the engine reaches optimal operating temperature. A gasket is included to ensure a proper seal and prevent leaks during installation.

Compatible Vehicles and Applications

This Dorman 902-5138 thermostat housing assembly is compatible with a range of Lexus and Toyota vehicles, specifically the Corolla, CT200h, Prius, Prius AWD-e, Prius Plug-In, Prius Prime, and Prius V models. It is engineered to meet the specifications required for these vehicles, making it a suitable replacement part for maintaining engine cooling system integrity.

Common Issues Addressed by This Thermostat Housing Assembly

• Engine overheating due to thermostat failure
• Coolant leaks from damaged or cracked housing
• Inconsistent engine temperature regulation
• Reduced engine performance caused by improper coolant flow
• Failed thermostat causing delayed engine warm-up

Installation Notes and Tips

Installation requires removal of the old thermostat housing and careful cleaning of the mounting surface to ensure a proper seal. The included gasket must be positioned correctly to prevent coolant leaks. Note that mounting hardware is not included, so original bolts should be reused or replaced as needed. Verify the thermostat opens at 180°F to match engine requirements. Proper torque specifications should be followed to avoid damage to the plastic housing.

Quality Assurance and Warranty Information

Dorman parts are manufactured to meet or exceed OEM standards for fit, form, and function. The 902-5138 thermostat housing assembly undergoes quality checks to ensure durability and reliable performance. This product includes a gasket and thermostat to provide a comprehensive replacement solution. Warranty coverage details can be obtained from the product documentation or manufacturer.