Dorman 902-1003 Engine Coolant Thermostat Housing - Lower or Upper

Engine Coolant Thermostat Housing for Ford Applications

Dorman 902-1003 is a replacement engine coolant thermostat housing built for specified Ford, Mercury, and Lincoln vehicles. It uses a metal housing with a gasket included and an integrated air vent to support cooling system service on applications such as the Ford Explorer, Mustang, and Thunderbird.

Key Features

• Metal construction with a natural finish for a stock-style appearance
• Outlet port diameter: 1.5 in.
• Gasket or seal included for installation
• Air vent (bleeder valve) included
• Two mounting holes with 0.313 in. diameter
• 180-degree housing neck angle
• Thermostat not included
• Bolts not included

Detailed Description

This Dorman thermostat housing is engineered to match the fit and durability of the original housing on listed vehicles. The metal body is built to handle repeated temperature swings in the cooling system, helping maintain a secure seal at the thermostat location. Part number 902-1003 is used across a wide range of Ford truck, van, and passenger car applications, including 1999-2001 Ford Explorer lower cooling system positions, 1979-1995 Ford Mustang, and 1991-1993 Ford Thunderbird. This part cross-references Motorad 4884KT for the same application.

What It Helps Address

• Coolant leaks at the thermostat housing
• Cracked or warped original housing
• Corrosion at the coolant outlet connection
• Bleeding air from the cooling system after service
• Fitment issues caused by a worn OE housing

Installation Notes and Tips

Verify the vehicle year, make, model, and housing position before installation. This housing uses a 180-degree neck angle and a 1.5-inch outlet port, so confirm hose routing and connector orientation on your application. Clean the mating surfaces thoroughly before installing the included gasket, and transfer any required thermostat separately since it is not included. Part number 902-1003 is also listed for select Mercury Mountaineer, Ford Bronco, E-Series vans, F-Series trucks, and Lincoln Mark VII applications.

Quality Assurance

Dorman designs this replacement thermostat housing to match stock fit and durability while withstanding extreme temperature changes for extended service life. It is built as a direct replacement for specified cooling system applications.