Dorman 902-5137 Engine Coolant Thermostat Housing Assembly

Reliable Engine Coolant Thermostat Housing Assembly for Lexus Vehicles

The Dorman 902-5137 Engine Coolant Thermostat Housing Assembly is designed specifically for select Lexus models including the GS350, GS450h, IS250, IS300, IS350, RC300, and RC350. This assembly ensures proper engine temperature regulation with a durable plastic housing and an included thermostat calibrated to open at 180 degrees Fahrenheit.

• Constructed from durable black plastic for corrosion resistance
• Includes thermostat and gasket for a complete installation
• Designed with a 1.285-inch inside diameter for precise coolant flow
• Features three mounting holes for secure attachment
• Flange dimensions: 3.277 inches length, 3.209 inches width, and 0.396 inches thickness
• Single outlet port design without bleeder hole
• Compatible with multiple Lexus models: GS350, GS450h, IS250, IS300, IS350, RC300, RC350

Detailed Product Description

The Dorman 902-5137 thermostat housing assembly is engineered to maintain optimal engine temperature by housing the thermostat that opens at 180°F. Made from high-quality plastic, the housing resists corrosion and heat damage common in engine compartments. The assembly includes a gasket to ensure a tight seal and prevent coolant leaks. With three mounting holes and precise flange dimensions, it fits securely on the engine block. This part is designed for regular grade use and does not include mounting hardware, so existing bolts should be reused or sourced separately.

Common Applications and Problem Resolution

• Replaces cracked or leaking thermostat housings
• Solves engine overheating caused by faulty thermostat operation
• Prevents coolant leaks that can lead to engine damage
• Restores proper coolant flow in Lexus GS350, IS350, and RC350 models
• Addresses thermostat failure symptoms such as erratic temperature gauge readings

Installation Notes and Tips

Before installation, ensure the engine is cool and the cooling system is depressurized. Remove the old thermostat housing carefully to avoid damaging surrounding components. Clean the mounting surface thoroughly to ensure a proper seal with the included gasket. Since mounting hardware is not included, retain original bolts or acquire compatible replacements. Torque bolts evenly to manufacturer specifications to prevent leaks or warping.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit and function. The 902-5137 thermostat housing assembly undergoes rigorous quality control to ensure durability and reliable performance. This product includes a gasket and thermostat to provide a complete solution for your cooling system needs. Warranty coverage details can be obtained from the product documentation or Dorman directly.