Dorman 902-5137 Engine Coolant Thermostat Housing Assembly

Engine Coolant Thermostat Housing Assembly

Dorman 902-5137 is a replacement engine coolant thermostat housing assembly built to match the fit and durability of the original housing on specified Lexus applications. It features a plastic black housing, an included gasket, and an integrated thermostat set to open at 180 degrees F for direct cooling system service.

Compatible with Lexus GS350, GS450h, IS250, IS300, IS350, RC300, and RC350 applications, this thermostat housing assembly is engineered for vehicles that use an integrated cover design. The Dorman 902-5137 part number is a direct-fit service solution for cooling system repairs on select Lexus models.

• Plastic housing with black finish
• Integrated thermostat included, opening at 180 degrees F
• Gasket included for sealing at installation
• Three mounting holes and one outlet port
• OE-style replacement for select Lexus cooling system layouts

Fitment Details

• Fits 2013-2018 Lexus GS450h, N/A; engine coolant thermostat housing assembly with integrated cover.
• Fits 2007-2011 Lexus GS450h, N/A; engine coolant thermostat housing assembly with integrated cover.
• Fits 2016-2017 Lexus IS300, N/A; engine coolant thermostat housing assembly with integrated cover.
• Fits 2006-2017 Lexus IS350, N/A; engine coolant thermostat housing assembly with integrated cover.
• Fits 2016-2017 Lexus RC300, N/A; engine coolant thermostat housing assembly with integrated cover.
• Fits 2015-2017 Lexus RC350, N/A; engine coolant thermostat housing assembly with integrated cover.
• Fits 2013-2015 Lexus GS350, N/A; engine coolant thermostat housing assembly with integrated cover.
• Fits 2007-2011 Lexus GS350, N/A; engine coolant thermostat housing assembly with integrated cover.
• Fits 2006-2015 Lexus IS250, N/A; engine coolant thermostat housing assembly with integrated cover.

What It Helps Repair

• Coolant leaks at the thermostat housing
• Cracked or heat-damaged plastic housing
• Sticking thermostat that affects engine temperature control
• Failed gasket sealing at the housing interface
• Cooling system service on select Lexus GS, IS, and RC models

Installation Notes

Verify the housing shape, outlet port layout, and mounting hole pattern against the original part before installation. Replace the gasket during service and inspect the mating surfaces for corrosion, residue, or warping. Bleeding the cooling system after installation helps restore proper coolant circulation and temperature control.

Quality Assurance

Dorman designs this replacement thermostat housing assembly to match stock fit and durability on the listed vehicles and to withstand repeated temperature cycling for extended service life. This part cross-references Beck/Arnley 143-0879 and Gates 34711 for the same application.