Dorman 902-5902 Engine Coolant Thermostat Housing Assembly

Engine Coolant Thermostat Housing Assembly

Dorman 902-5902 is a replacement engine coolant thermostat housing assembly built to match the fit and durability of the stock housing on specified vehicles. It uses a metal housing with a gasket and thermostat included, and it is engineered to handle repeated temperature swings in the cooling system.

Compatible with Nissan Maxima, Murano, Pathfinder, Altima, Quest, and INFINITI QX60 applications, this thermostat housing assembly supports proper coolant flow control and a secure sealing surface for the cooling circuit. The Dorman 902-5902 is a direct-fit service part for vehicles that use an integrated cover design.

Key Features

• Metal thermostat housing construction with a natural finish
• Gasket and thermostat included for service replacement
• 180 degree F thermostat opening temperature
• One outlet port and three mounting holes
• Designed for vehicles with an integrated thermostat housing cover
• Cross-references Beck/Arnley 143-0874 and Gates 34706 for the same application

Detailed Description

This engine coolant thermostat housing assembly is built for cooling-system service on Nissan and INFINITI vehicles that require a housing with an integrated cover. The housing measures 4.154 inches in flange length, 2.789 inches in flange width, and 0.681 inch in flange thickness, with an inside diameter of 1.212 inches. The metal body and included gasket help provide a stable sealing interface where the thermostat mounts into the cooling system.

Use Dorman 902-5902 when replacing a worn, cracked, or leaking thermostat housing on applications such as the Nissan Altima, Murano, Pathfinder, Quest, and Maxima, as well as the INFINITI QX60 and JX35. This part number is also listed under interchange references including Beck/Arnley 143-0874, Bosch 15238, Four Seasons 66280, Gates 34706, and Motorad 1016-180.

What It Helps Fix

• Coolant leaks at the thermostat housing
• Cracked or warped housing surfaces
• Improper thermostat sealing
• Cooling-system temperature control issues
• Service problems caused by a damaged integrated cover

Installation Notes

Verify the vehicle’s engine coolant thermostat housing configuration before installation, especially on Nissan Maxima, Murano, Pathfinder, and Altima applications with an integrated cover. Transfer no mounting hardware unless your vehicle service procedure calls for reuse, since mounting hardware is not included. Replace the gasket during service, confirm the thermostat opening temperature is correct for the application, and inspect the mating surfaces for corrosion or debris before assembly.

Quality Assurance

Dorman designs this replacement housing to match stock fit and durability requirements and to withstand extreme temperature changes for extended service life. The metal construction and included sealing components support dependable cooling-system repair on the listed Nissan and INFINITI applications.