Four Seasons 85996 Engine Coolant Thermostat Housing - Lower

Thermostat Housing for Honda and Acura Cooling Systems

Four Seasons 85996 is an engine coolant thermostat housing built for select Honda and Acura applications. This plastic thermostat housing is supplied without a thermostat and without a gasket or seal, making it a direct replacement housing for cooling system service where the original housing is cracked, warped, or leaking.

Key Features

• Engine coolant thermostat housing for cooling system repair
• Plastic construction
• Thermostat not included
• Gasket or seal not included
• Meets or exceeds OEM requirements
• Lower-position applications where specified
• Four Seasons 85996 thermostat housing

Product Details

The Four Seasons Thermostat Housing line focuses on engine coolant components that restore proper coolant routing and thermostat mounting. Part number 85996 is a thermostat housing only, with a 2.5-inch bolt hole center-to-center measurement, 0.47-inch inlet port diameter, 0.558-inch flange thickness, and 3.352-inch overall height. It is built from plastic and is specified for applications that use a housing without an integrated thermostat. This part cross-references Motorad CH5996 for the same application.

Compatible With select Acura ILX, Acura TSX, Honda Civic, Honda CR-V, Honda Accord, and Honda Element applications. Common search terms include lower thermostat housing for 2006-2011 Honda Civic, lower thermostat housing for 2003-2009 Honda Accord, and Honda CR-V thermostat housing replacement. Four Seasons 85996 also appears in Acura TSX and Acura ILX cooling system fitments.

Common Problems This Part Can Address

• Coolant leaks at the thermostat housing
• Cracked or warped plastic housing
• Damaged sealing surface at the coolant outlet
• Improper thermostat mounting due to housing wear
• Cooling system service on Honda and Acura engines with lower housing placement

Installation Notes

• Verify the vehicle uses a thermostat housing without an included thermostat before installation.
• Inspect the mating surface and replace the gasket or seal as required, since it is not included.
• Confirm bolt hole spacing, inlet port diameter, and flange thickness against the original part.
• Drain coolant as needed before removing the existing housing.
• Use the vehicle service procedure for torque and coolant refill specifications.

Quality Assurance

Four Seasons 85996 meets or exceeds OEM requirements and is built as a replacement engine coolant thermostat housing for the listed Honda and Acura applications. The Four Seasons thermostat housing line is intended to support accurate fitment and dependable cooling system service on vehicles such as the Honda Civic, Honda Accord, and Acura TSX.