Dorman 902-800 Engine Coolant Thermostat Housing Assembly

Engine Coolant Thermostat Housing Assembly

Dorman 902-800 is a replacement engine coolant thermostat housing assembly for select Chevrolet, GMC, Buick, Saab, and Oldsmobile applications. It is built from aluminum with a gasket included and a thermostat set to open at 190 degrees F, giving you a direct-fit cooling system service part for the specified vehicles.

Key Features

• Aluminum housing with a natural finish
• Includes thermostat and gasket/seal
• 190 degrees F thermostat opening temperature
• 1.21 inside diameter with one outlet port
• Two mounting holes and OE-style flange dimensions
• Designed to match stock fit and durability for the listed applications

Detailed Product Overview

This Dorman thermostat housing assembly is engineered for the cooling system on select 2002-2009 Chevrolet Trailblazer, 2002-2009 GMC Envoy, 2005-2009 Saab 9-7x, 2004-2007 Buick Rainier, 2002-2006 Chevrolet Trailblazer EXT, 2002-2006 GMC Envoy XL, 2004-2005 GMC Envoy XUV, 2002-2004 Oldsmobile Bravada, and 2002 Chevrolet Blazer models. The aluminum construction helps the housing handle repeated temperature swings, while the included thermostat and gasket support a complete service replacement. Dorman 902-800 cross-references Gates 33939 and Motorad 413-160 for the same application.

Common Problems This Part Can Address

• Coolant leaks at the thermostat housing
• Cracked or warped original housing
• Improper thermostat operation from a worn assembly
• Cooling system temperature control issues
• Service failures caused by heat cycling and age

Installation Notes and Tips

Verify the engine code and cooling system configuration before ordering, since fitment is specific to the listed vehicles. Clean the mating surfaces thoroughly before installation, and inspect the hose connection and mounting points for corrosion or damage. This housing uses two mounting holes and does not include mounting hardware.

Quality Assurance

Dorman designs this replacement thermostat housing assembly to match the fit and durability of the original housing on the specified vehicles. The aluminum construction and OE-style dimensions support reliable service in demanding cooling system conditions.