Dorman 902-5174 Engine Coolant Thermostat Housing Assembly - Outer

Reliable Engine Coolant Thermostat Housing Assembly for Lexus and Toyota

The Dorman 902-5174 Engine Coolant Thermostat Housing Assembly is designed to maintain optimal engine temperature for Lexus Avalon, Toyota Camry, and Toyota ES300h models. This assembly includes a thermostat calibrated to open at 180 degrees Fahrenheit, ensuring efficient coolant flow and engine performance.

Key Features of Dorman 902-5174 Thermostat Housing Assembly

• Constructed from durable black plastic material for corrosion resistance
• Includes one thermostat housing, one thermostat, and one gasket for a complete replacement
• Thermostat opens at 180°F to regulate engine temperature effectively
• Features two mounting holes with a 3.2-inch bolt hole center-to-center spacing
• Flange dimensions: 3.9 inches length, 3.55 inches width, and 0.39 inches thickness
• Single outlet port design without a bleeder hole
• Gasket type included to ensure a secure seal and prevent leaks

Detailed Description of the Thermostat Housing Assembly

This engine coolant thermostat housing assembly by Dorman is engineered to meet the cooling system requirements of select Lexus and Toyota vehicles, including the Avalon, Camry, and ES300h. The black plastic housing offers resistance to heat and corrosion, contributing to long-term durability. The included thermostat is preset to open at 180 degrees Fahrenheit, allowing coolant to circulate when the engine reaches optimal operating temperature. The assembly’s flange and mounting hole specifications ensure proper fitment and secure installation. The gasket included with the assembly provides a reliable seal to prevent coolant leaks, maintaining system integrity.

Common Applications and Issues Addressed

• Replacement of cracked or damaged thermostat housing
• Resolving engine overheating due to thermostat failure
• Fixing coolant leaks around the thermostat housing area
• Restoring proper coolant flow in Lexus Avalon, Toyota Camry, and ES300h models
• Maintaining engine temperature regulation for efficient performance

Installation Notes and Tips

Ensure the engine is cool before beginning installation to avoid injury. Remove the old thermostat housing carefully to prevent damage to surrounding components. Clean the mounting surface thoroughly before installing the new gasket and housing assembly. Torque mounting bolts to manufacturer specifications to avoid leaks or damage. Since mounting hardware is not included, reuse existing bolts if they are in good condition or source replacements as needed.

Quality Assurance and Warranty Information

Dorman’s 902-5174 thermostat housing assembly is manufactured to meet OEM standards for fit and function. The plastic construction is designed to resist corrosion and withstand engine heat cycles. This product includes a thermostat and gasket to ensure a complete and reliable replacement. Warranty details should be confirmed with the distributor or manufacturer for coverage specifics.