Dorman 902-2020 Engine Coolant Thermostat Housing

Engine Coolant Thermostat Housing for Classic GM and Jeep Applications

Dorman 902-2020 is a replacement engine coolant thermostat housing built to match the fit and durability of the original housing on specified vehicles. With a metal construction and included gasket, it is designed for cooling system service on classic Buick, Chevrolet, Oldsmobile, Pontiac, and Jeep applications.

Compatible With 1965-1980 Buick Riviera, LeSabre, Skylark, Century, Regal, Skyhawk, and 1970-1979 Pontiac Firebird, Grand Prix, Catalina, LeMans, and related models, this housing addresses common cooling-system service needs on older engines. The Dorman 902-2020 part number is also referenced for several OE-style replacement applications.

Key Features

• Metal thermostat housing with natural finish
• Includes gasket for sealing at the housing interface
• Two mounting holes with 0.313 in. diameter
• 45-degree housing neck angle
• Outlet port diameter: 1.43 in.
• No thermostat included
• No bleeder valve and no bolts included

Detailed Description

This Dorman engine coolant thermostat housing is engineered as a direct replacement for specified cooling system applications. The metal body is built to handle repeated temperature swings, helping maintain a secure seal where the thermostat housing connects to the engine coolant passage. The Dorman 902-2020 is a practical choice for service on Buick Riviera, Pontiac Firebird, Chevrolet Monte Carlo, and other listed vehicles where the original housing has corroded, warped, or cracked.

This part cross-references ACI 84853 and Motorad 4853KT for the same application. It is listed across a broad range of 1965-1980 GM and Jeep fitments, including Buick Skylark, Oldsmobile Cutlass, and Jeep CJ5 cooling system applications.

What It Helps Address

• Coolant leaks at a damaged thermostat housing
• Warping or cracking from heat cycling
• Corrosion at the coolant outlet connection
• Poor sealing at the thermostat housing gasket surface
• Cooling system service on aging GM and Jeep engines

Installation Notes and Tips

Verify the outlet port diameter, mounting hole spacing, and 45-degree neck angle against the original housing before installation. Clean the mating surfaces thoroughly, inspect the thermostat and adjacent coolant hoses, and replace any worn sealing surfaces before reassembly. This housing is supplied with a gasket; bolts are not included.

Fitment examples include 1970-1980 Buick Riviera, 1977-1979 Pontiac Firebird, 1978-1979 Chevrolet Monza, 1977-1979 Oldsmobile Cutlass Supreme, and 1970-1971 Jeep Wagoneer. Confirm the exact engine and emissions configuration where noted in the fitment data, such as 1979 Chevrolet models with Federal Emissions.

Quality Assurance

Dorman designs this replacement thermostat housing to match stock fit and durability requirements for the listed vehicles. The metal construction is selected to withstand extreme temperature changes and support long service life in the cooling system.