Facet 7.8370S Engine Coolant Thermostat

Engine Coolant Thermostat for Toyota and Lexus

Facet 7.8370S is an engine coolant thermostat for select Toyota and Lexus V8 applications. It is used to regulate coolant flow so the engine reaches and maintains proper operating temperature. This part number 7.8370S is a direct-fit option for multiple Toyota 4Runner, Sequoia, Tundra, Land Cruiser, and Lexus GS430, LS430, LX470, SC430, GX470, and LS400 applications.

Key Features

• Engine coolant thermostat for temperature control in the cooling system
• Compatible with select Toyota 4Runner, Sequoia, Tundra, and Land Cruiser models
• Also fits select Lexus GS430, LS430, LX470, SC430, GX470, GS400, LS400, and SC400 applications
• Facet part number 7.8370S for accurate catalog matching
• Position listed as N/A for the supported applications

Detailed Description

Facet 7.8370S is an engine coolant thermostat used in cooling system service on select Toyota and Lexus vehicles. It is a fitment-based replacement for applications including 2000-2006 Toyota Tundra, 2001-2006 Toyota Sequoia, 2003-2006 Toyota 4Runner, 1998-2005 Toyota Land Cruiser, and related Lexus models such as the GS430, LS430, LX470, SC430, GX470, GS400, LS400, and SC400. If you are searching for a Toyota 4Runner thermostat, Lexus LS430 thermostat, or Toyota Tundra coolant thermostat, this part number 7.8370S matches the listed applications.

Common Uses

• Engine runs cooler than normal or takes too long to warm up
• Engine temperature fluctuates during driving
• Cooling system service on Toyota and Lexus V8 platforms
• Replacement of a thermostat during overheating diagnosis
• Restoring proper coolant flow control after thermostat failure

Installation Notes

Verify engine application by year, make, and model before installation. Some listed applications note that a gasket is not provided, while others specify gasket included: N; confirm the existing housing and sealing surface condition before assembly. Follow the vehicle service procedure for coolant draining, thermostat orientation, and bleed steps after installation.

Quality Assurance

Facet is a recognized aftermarket brand for engine management and thermal control components. Part number 7.8370S is cataloged for the listed Toyota and Lexus applications to support accurate replacement selection.