Dorman 902-5050 Engine Coolant Thermostat Housing

Engine Coolant Thermostat Housing for Mazda

Dorman 902-5050 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 repeated temperature swings in the cooling system, helping maintain a secure thermostat mounting point on Mazda B2000 and Mazda 626 applications.

• Metal construction with a natural finish
• Includes gasket for a direct housing replacement
• 90-degree housing neck angle
• Outlet port diameter: 1.375 in.
• Two mounting holes with 0.313 in. diameter
• No bleeder valve; thermostat not included

Detailed Fitment and Application

Compatible with 1980-1984 Mazda B2000 and 1979-1982 Mazda 626 cooling system applications, this thermostat housing is designed for the engine coolant circuit where a secure seal and stable coolant flow are required. The Dorman 902-5050 housing follows the stock-style layout for these Mazda models and is a practical replacement when the original housing is corroded, cracked, or no longer sealing properly. This part cross-references Anchor 9260 for the same application.

Common Problems This Part Can Address

• Coolant leaks at the thermostat housing flange
• Cracked or warped original housing surfaces
• Corrosion around the coolant outlet neck
• Poor sealing at the thermostat housing gasket surface
• Cooling system service needs on Mazda B2000 and Mazda 626 vehicles

Installation Notes and Tips

Verify the outlet port diameter, mounting hole spacing, and 90-degree neck angle before installation. Clean the mating surfaces thoroughly, inspect the thermostat and adjacent hoses, and replace any damaged coolant seals or hoses during service. This housing includes a gasket; bolts are not included.

Quality Assurance

Dorman designs this replacement thermostat housing to match the stock part’s fit and durability while using metal construction for service in high-temperature cooling system environments. It is built for the specified Mazda B2000 and Mazda 626 applications and is intended to provide a direct replacement solution for the original housing.