Dorman 902-5034 Engine Coolant Thermostat Housing

Engine Coolant Thermostat Housing for Mazda

Dorman 902-5034 is a replacement engine coolant thermostat housing built for specified Mazda cooling system applications. It matches the stock housing’s fit and durability requirements and uses a metal construction to handle repeated temperature swings in daily driving.

Compatible with 1993-2002 Mazda 626 and 1993-1997 Mazda MX-6, this thermostat housing includes a gasket for a direct cooling system service. The natural-finish housing features a 1.313-inch outlet port, a 45-degree neck angle, and two mounting holes for the specified application.

• Metal thermostat housing for cooling system service
• Includes gasket; thermostat not included
• 1.313-inch outlet port diameter
• 45-degree housing neck angle
• Two mounting holes with 0.313-inch diameter
• No bleeder valve and no bolts included
• Natural finish housing for specified Mazda applications

Detailed Product Overview

This Dorman thermostat housing, part number 902-5034, is engineered as a direct replacement for the original engine coolant thermostat housing on select Mazda 626 and Mazda MX-6 models. It is built from metal to support long-term use in the cooling system and to maintain proper housing integrity through heat cycling. The included gasket helps complete the sealing surface for service work on the thermostat housing area.

This part cross-references Dorman - Conduct-Tite 85154 for the same application. It also interchanges with 815154, CH6034, and FS0515172.

Common Repair Uses

• Cracked or warped thermostat housing
• Coolant seepage at the housing-to-engine sealing surface
• Cooling system service on a Mazda 626 or Mazda MX-6
• Replacement of a housing with damaged outlet neck or mounting points
• Restoration of proper coolant routing at the thermostat location

Installation Notes and Tips

Verify the outlet port diameter, 45-degree neck angle, and two-hole mounting pattern before installation. Clean the mating surface thoroughly before fitting the included gasket, and transfer any reusable thermostat components only if they match the vehicle specification. This housing does not include bolts or a bleeder valve.

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.