Dorman 902-700 Engine Coolant Thermostat Housing Assembly

Engine Cooling Replacement for GM Applications

Dorman 902-700 is an engine coolant thermostat housing assembly built as a direct replacement for specified GM vehicles. It combines the thermostat housing, thermostat, and gasket in a metal housing designed to match stock fit and durability while handling repeated temperature swings in the cooling system.

Compatible With 1997-2003 Chevrolet Corvette, 1999-2003 Chevrolet Silverado 1500, and 2000-2003 GMC Yukon applications that use the listed water pump casting and thermostat retainer bracket configuration.

Key Features

• Metal thermostat housing with a natural finish
• Includes thermostat and gasket for a complete cooling-system service point
• 186 degree Fahrenheit thermostat opening temperature
• Two mounting holes and one outlet port
• Engineered to match OE fit and durability on listed vehicles
• Cross-references Gates 33910 and Stant 14298 for the same application

Detailed Product Overview

This Dorman thermostat housing assembly, part number 902-700, is built for vehicles that require a specific OE-style coolant outlet and thermostat setup. The metal construction, gasket seal, and matched thermostat help restore proper coolant flow control in the engine cooling system. It is a direct-fit replacement for a wide range of Chevrolet, GMC, Cadillac, Hummer, and Pontiac models, including Chevrolet Silverado, Tahoe, Suburban, Corvette, and GMC Sierra applications.

Use this assembly when servicing a leaking, warped, or cracked thermostat housing, or when replacing a thermostat during cooling-system maintenance. The housing is sized with a 1.236 inside diameter and uses a gasket seal for the mounting interface.

Common Problems This Part Addresses

• Coolant seepage at the thermostat housing
• Cracked or corroded housing surfaces
• Sticking thermostat causing temperature control issues
• Improper sealing at the coolant outlet
• Cooling-system service on GM trucks, SUVs, and performance cars

Installation Notes and Tips

Verify the water pump casting number 12562459 and thermostat retainer bracket configuration before ordering. This assembly does not include mounting hardware. Clean the mating surfaces thoroughly, inspect the coolant hose connection, and replace old coolant after installation. The thermostat opens at 186 degrees Fahrenheit, so confirm that temperature specification matches the vehicle requirement.

Quality Assurance

Dorman designs this replacement thermostat housing assembly to match the fit and durability of the original housing on specified vehicles and to withstand extreme temperature changes for extended service life.