Stant 49408 Engine Coolant Thermostat / Water Outlet Assembly

Integrated Thermostat Housing for Lexus Cooling Systems

Stant 49408 is an engine coolant thermostat and water outlet assembly built with the thermostat integrated into the housing. That one-piece design simplifies service on Lexus cooling systems while providing a direct replacement for the original thermostat housing assembly. It is specified at 180 degrees Fahrenheit and is made from durable material for long service life.

Key Features

• Integrated thermostat housing assembly for streamlined replacement
• 180 degrees Fahrenheit thermostat rating
• Durable housing construction for extended service life
• Water outlet thermostat housing design for cooling system service
• Stant 49408 application-specific fitment for select Lexus models
• Part number 49408 for accurate ordering and catalog lookup

Product Details

The Stant Integrated Thermostat Housing line combines the thermostat and housing into a single service part, reducing the need to separate components during replacement. For Lexus GS350, IS350, IS250, GS300, GS450h, IS300, RC300, and RC350 applications, this assembly is built around a 180 degree thermostat setting to match the listed vehicle requirements. Stant 49408 is a practical choice when replacing a worn water outlet thermostat housing on select Lexus cooling systems.

Measured specifications include a bypass plate diameter of 1.17 inches, flange diameter with seal of 1.57 inches, flange diameter without seal of 2.42 inches, and a height from flange to bottom of 1.67 inches. These dimensions help confirm proper housing fitment during parts selection.

Vehicle Fitment

• Fits 2013-2018 Lexus GS450h, N/A; Temperature 180 Degrees; Integrated Thermostat Housing
• Fits 2007-2011 Lexus GS450h, N/A; Temperature 180 Degrees; Integrated Thermostat Housing
• Fits 2016-2018 Lexus IS300, N/A; Temperature 180 Degrees; Integrated Thermostat Housing
• Fits 2006-2017 Lexus IS350, N/A; Temperature 180 Degrees; Integrated Thermostat Housing
• Fits 2016-2017 Lexus RC300, N/A; Temperature 180 Degrees; Integrated Thermostat Housing
• Fits 2015-2016 Lexus RC350, N/A; Temperature 180 Degrees; Integrated Thermostat Housing
• Fits 2013-2015 Lexus GS350, N/A; Temperature 180 Degrees; Integrated Thermostat Housing
• Fits 2007-2011 Lexus GS350, N/A; Temperature 180 Degrees; Integrated Thermostat Housing
• Fits 2006-2015 Lexus IS250, N/A; Temperature 180 Degrees; Integrated Thermostat Housing
• Fits 2006 Lexus GS300, N/A; Temperature 180 Degrees; Integrated Thermostat Housing

Common Problems This Part Addresses

• Leaking thermostat housing or water outlet assembly
• Sticking thermostat that affects coolant flow control
• Cracked or aged housing material in the cooling system
• Cooling system service on select Lexus GS, IS, and RC models
• Replacement of a thermostat and housing assembly in one service step

Installation Notes and Tips

Verify the 180 degree temperature rating and compare the housing dimensions before installation. Confirm the vehicle application against the listed Lexus fitment for GS350, GS450h, IS250, IS350, IS300, RC300, RC350, and GS300 models. Clean the mating surfaces thoroughly and inspect the cooling system for related wear before installing Stant 49408.

Quality Assurance

Stant manufactures cooling system components with application-specific engineering, and this Integrated Thermostat Housing is built from durable material for long-lasting service. Part number 49408 is cataloged for select Lexus applications and is a direct-fit cooling system replacement for the listed vehicles.