Dorman 902-2055 Engine Coolant Thermostat Housing

Engine Coolant Thermostat Housing for GMC and Chevrolet Vans

Dorman 902-2055 is a replacement engine coolant thermostat housing built to match the fit and durability of the original housing on specified vehicles. It is made from metal and engineered to handle extreme temperature changes, helping maintain reliable cooling system performance on GMC and Chevrolet van applications.

• Metal construction with a natural finish
• Outlet port diameter: 1.375 in.
• Gasket included for a proper seal
• Two mounting holes with 0.313 in. diameter
• Housing neck angle: 80 degrees
• No bleeder valve; thermostat not included
• Package contents: thermostat housing with gasket

Fitment and Cross-Reference

Compatible with 1975-1978 Chevrolet G10, G20, and G30 models, plus 1975-1978 GMC G15, G25, and G35 vans with cover-style, wo/threaded fitting applications. It also fits 1973-1974 GMC G15/G1500 Van, G25/G2500 Van, and G35/G3500 Van, as well as 1971-1972 GMC G15/G1500 Van, G25/G2500 Van, and G35/G3500 Van with vertical outlet cover applications. Additional coverage includes 1965-1966 GMC G1000 Series with vertical outlet cover configuration. This part cross-references Motorad CH3055 and ACI 84804 for the same application. Dorman 902-2055 is a direct-fit search term for owners looking for a replacement thermostat housing for classic GMC and Chevrolet van cooling systems.

What This Part Helps Address

• Cracked or corroded thermostat housing
• Coolant leaks at the housing-to-engine seal
• Warped sealing surfaces that affect coolant retention
• Cooling system service on older GMC and Chevrolet vans
• Replacement needs after thermostat housing damage from heat cycling

Installation Notes and Tips

Verify the outlet style, neck angle, and mounting-hole layout before installation. Use the included gasket and confirm the sealing surfaces are clean and flat before assembly. This housing does not include a thermostat, so transfer or replace the thermostat separately as needed. Dorman 902-2055 is designed for specified GMC and Chevrolet applications, including 1975-1978 Chevrolet G10/G20/G30 and 1975-1978 GMC G15/G25/G35 van fitments.

Quality Assurance

Dorman designs replacement cooling system components to match original fit and service requirements on listed vehicles. This thermostat housing is built to withstand repeated temperature changes for dependable service in classic GMC and Chevrolet van applications.