Dorman 902-5125 Engine Coolant Thermostat Housing Assembly

Engine Coolant Thermostat Housing Assembly

Dorman 902-5125 is a replacement engine coolant thermostat housing assembly built to match the fit and durability of the original housing on specified Nissan and INFINITI vehicles. It includes a thermostat and gasket, and the metal housing is made to handle repeated temperature swings in everyday cooling system service.

Key Features

• Metal thermostat housing with a natural finish
• Integrated thermostat included, opening at 180 degrees F
• Gasket included for sealing at installation
• Three mounting holes and one outlet port
• Inside diameter: 1.21 in.
• Flange dimensions: 4.019 in. long, 2.76 in. wide, 0.686 in. thick
• No bleeder hole
• Part number: 902-5125

Detailed Description

This thermostat housing assembly is designed for vehicles that use an integrated cover style cooling system housing. It is a direct-fit replacement for select 2002-2006 Nissan Altima, 2002-2008 Nissan Maxima, 2003-2007 Nissan Murano, 2004-2009 Nissan Quest, and 2002-2004 INFINITI I35 applications. Dorman 902-5125 is built from metal for strength and includes the thermostat and gasket needed for a complete housing service on these listed models. This part cross-references Gates 33951 for the same application.

Common Problems It Can Help Address

• Coolant leaks at a cracked or warped thermostat housing
• Engine temperature fluctuations caused by a worn thermostat
• Sealing issues from a deteriorated housing gasket
• Cooling system service needs on Nissan Altima, Maxima, Murano, Quest, and INFINITI I35 models
• Replacement of an aging integrated thermostat housing assembly

Installation Notes and Tips

Verify the housing style, mounting hole layout, and outlet configuration before installation. Clean the mating surfaces thoroughly, inspect adjacent coolant hoses and clamps, and refill the cooling system with the correct coolant after service. Because mounting hardware is not included, reuse or source the required fasteners separately if needed. Confirm fitment for your exact year and engine application before ordering Dorman 902-5125.

Quality Assurance

Dorman engineers this replacement housing assembly to match the stock fit and durability of the original part and to withstand extreme temperature changes for extended service life. Part number 902-5125 is built for the listed Nissan and INFINITI applications and follows a regular-grade replacement design.