Dorman 902-1040 Engine Coolant Thermostat Housing - Upper

Dorman 902-1040 Engine Coolant Thermostat Housing

Dorman 902-1040 is a replacement engine coolant thermostat housing built for specified Ford Ranger and Mazda B3000 applications. It matches the stock housing’s fit and durability requirements while using a metal construction made to handle repeated temperature swings in the cooling system.

Key Features

• Metal thermostat housing with a natural finish
• Includes gasket for sealing at installation
• 45-degree housing neck angle
• 1.438-inch outlet port diameter
• Two mounting holes with 0.313-inch diameter
• No bleeder valve and no thermostat included
• Package contents: thermostat housing with gasket

Detailed Description

This thermostat housing is engineered as a direct replacement for the original cooling-system housing on 2002-2008 Ford Ranger upper applications and 2002-2008 Mazda B3000 cooling-system applications. The Dorman 902-1040 housing is built from metal to help maintain structural integrity through heat cycling, pressure changes, and long-term engine operation. It is a practical choice when the original housing is cracked, warped, or leaking at the sealing surface.

This part cross-references Four Seasons 85187 and Gates CO34779 for the same application. It also aligns with OE-style references including 1F6115172 and 2L5Z8592AA.

What It Helps Fix

• Coolant leaks at the thermostat housing
• Cracked or warped housing surfaces
• Improper sealing at the gasket interface
• Cooling-system service issues on Ford Ranger and Mazda B3000 models
• Heat-related housing deterioration

Installation Notes and Tips

Verify the outlet port diameter, 45-degree neck angle, and two-hole mounting pattern before installation. Transfer only the components required for your application, and inspect the mating surface for corrosion or old gasket material before fitting the new housing. This part is used on 2002-2008 Ford Ranger upper cooling-system applications and 2002-2008 Mazda B3000 cooling-system applications.

Quality Assurance

Dorman designs this replacement thermostat housing to match the fit and durability of the original part on specified vehicles and to withstand extreme temperature changes for extended service life.