Dorman 902-2127 Engine Coolant Thermostat Housing - Upper

Engine Coolant Thermostat Housing for HD Trucks

Dorman 902-2127 is a replacement engine coolant thermostat housing built to match the fit and durability of the original housing on specified vehicles. Made from aluminum with a natural finish, it is engineered for high-heat cooling system service and repeated temperature changes.

Compatible With 2004-2010 Chevrolet Silverado 2500 HD, upper; 2007-2010 Chevrolet Silverado 3500 HD, upper; 2004-2010 GMC Sierra 2500 HD, upper; and 2007-2010 GMC Sierra 3500 HD, upper. This Dorman 902-2127 housing also fits 2007 Chevrolet Silverado 2500 HD Classic and Silverado 3500 Classic, plus 2007 GMC Sierra 2500 HD Classic and Sierra 3500 Classic in the upper cooling system position.

Key Features

• Aluminum construction for strength and heat resistance
• Natural finish housing for direct replacement service
• 90-degree housing neck angle
• 4 mounting holes with 4.65 in. bolt hole center spacing
• Inlet port diameter: 2 in.; outlet port diameter: 1.95 in.
• Flange thickness: 0.787 in.; mounting hole diameter: 0.355 in.
• No thermostat, gasket, O-rings, bleeder valve, or bolts included

Detailed Description

This engine coolant thermostat housing is designed for upper cooling system applications on Chevrolet Silverado HD and GMC Sierra HD trucks. Dorman 902-2127 follows the stock housing layout for the listed vehicles, with a 90-degree neck angle and port sizing that supports proper coolant routing in the thermostat area. It is a direct-fit replacement for service on the Silverado 2500 HD, Silverado 3500 HD, Sierra 2500 HD, and Sierra 3500 HD platforms, including the 2007 Classic models.

This part cross-references Motorad CH6007 and OE number 97361881 for the same application.

What It Helps Fix

• Cracked or warped thermostat housing
• Coolant leaks at the upper housing connection
• Corrosion or heat-related housing damage
• Improper sealing at the thermostat housing interface
• Cooling system service issues on the upper outlet side

Installation Notes and Tips

Verify engine and cooling system configuration before installation. Because no gasket, O-rings, thermostat, or bolts are included, transfer or replace the required sealing components separately as needed. Clean the mating surfaces thoroughly and inspect the hose connection points, mounting holes, and adjacent coolant passages before reassembly.

Quality Assurance

Dorman replacement housings are engineered to match the fit and durability of the original part on the listed Chevrolet and GMC applications. The aluminum construction is selected to handle extreme temperature changes in cooling system use.