Dorman 902-853 Engine Coolant Thermostat Housing

Engine Coolant Thermostat Housing for GM Vans

Dorman 902-853 is a replacement engine coolant thermostat housing for select Chevrolet and GMC applications. It is built from aluminum with a silver finish and a 90-degree neck angle from the base to match the original housing layout on covered vehicles.

For Chevrolet G20, G30, P20, and P30 models, as well as GMC G2500, G3500, and P2500/P3500 applications, this thermostat housing is designed to match stock fit and durability requirements in the cooling system.

Key Features

• Aluminum construction for cooling-system service
• Silver finish
• 90-degree housing neck angle from base
• 1.75 outlet port diameter
• Three mounting holes with 0.438 mounting hole diameter
• Gasket included
• No thermostat included
• No bleeder valve, no bolts, and no O-rings included

Detailed Description

This Dorman 902-853 engine coolant thermostat housing is engineered as a direct replacement for specified Chevrolet and GMC cooling system applications. The aluminum housing is shaped to match the original mounting and outlet configuration, helping maintain proper coolant routing at the thermostat location. It cross-references Focus Auto Parts 84988 and also references 15-1487, 14057156, and CH2853 for the same application.

Compatible With 1983-1996 Chevrolet G30, 1983-1995 Chevrolet G20, 1985-1995 Chevrolet P30, 1985-1989 Chevrolet P20, 1983-1996 GMC G3500, 1983-1995 GMC G2500, 1985-1995 GMC P3500, and 1985-1989 GMC P2500 cooling system applications. Dorman 902-853 is a practical replacement when the original thermostat housing is cracked, corroded, or no longer sealing correctly.

What It Helps Fix

• Coolant leaks at the thermostat housing
• Cracked or warped original housing
• Corrosion around the coolant outlet
• Poor sealing at the thermostat housing gasket surface
• Cooling system service on aging Chevrolet and GMC vans and chassis cabs

Installation Notes and Tips

Verify outlet diameter, mounting hole count, and neck angle before installation. Clean the mating surfaces thoroughly and inspect the gasket surface for pitting or debris before assembly. This housing includes a gasket, but does not include a thermostat, bolts, or O-rings, so confirm all required service parts are on hand before beginning the repair.

Quality Assurance

Dorman designs this replacement thermostat housing to match the fit and durability of the original part on specified vehicles and to withstand repeated temperature changes in the cooling system.