Dorman 902-2800 Engine Coolant Thermostat Housing Assembly

Engine Coolant Thermostat Housing Assembly

Dorman 902-2800 is a replacement engine coolant thermostat housing assembly built for specified GM and Saab applications. It matches the stock housing’s fit and durability while using aluminum construction to handle repeated temperature swings in the cooling system.

Compatible with vehicles such as the Chevrolet Trailblazer, GMC Envoy, Buick Rainier, and Saab 9-7x, this thermostat housing assembly includes the thermostat and gasket needed for a direct replacement service. The Dorman 902-2800 is a practical choice when servicing a leaking, warped, or temperature-control-related housing.

Key Features

• Aluminum housing with a natural finish
• Includes thermostat and O-ring gasket
• 160 degree thermostat opening temperature
• 1 outlet port and 2 mounting holes
• Designed to match OE fit and dimensions
• Cross-references Motorad 413-160 and OE part number 12567750

Detailed Description

This engine coolant thermostat housing assembly is engineered for direct replacement on select Chevrolet, GMC, Buick, Saab, and Oldsmobile models. Dorman 902-2800 uses an aluminum housing with a 1.068 inside diameter, 3.841 flange length, 3.847 flange width, and 0.36 flange thickness for a precise fit in the cooling system. The assembly includes the thermostat set to open at 160 degrees Fahrenheit, along with the gasket and thermostat housing required for the application.

Fits 2002-2009 Chevrolet Trailblazer, N/A; Fits 2002-2009 GMC Envoy, N/A; Fits 2005-2009 Saab 9-7x, N/A; Fits 2004-2007 Buick Rainier, N/A; Fits 2002-2006 Chevrolet Trailblazer EXT, N/A; Fits 2002-2006 GMC Envoy XL, N/A; Fits 2004-2005 GMC Envoy XUV, N/A; Fits 2002-2004 Oldsmobile Bravada, N/A; Fits 2002 Chevrolet Blazer, N/A.

Common Repair Uses

• Replacing a cracked or leaking thermostat housing
• Restoring proper coolant flow and temperature regulation
• Addressing overheating caused by a faulty thermostat assembly
• Repairing warped or corroded cooling system housing surfaces
• Servicing a cooling system with a damaged O-ring seal

Installation Notes and Tips

Confirm the vehicle application and thermostat opening temperature before installation. Inspect the mating surfaces, clean the coolant passages, and replace coolant as needed during service. Mounting hardware is not included, so reuse or source the correct fasteners for the vehicle. Verify the 2-bolt pattern and outlet orientation against the original housing before assembly.

Quality Assurance

Dorman designs this replacement thermostat housing assembly to match the fit and durability of the original part on listed vehicles. The aluminum construction is selected to withstand repeated temperature changes in normal cooling system operation.