Gates CO34931 Engine Coolant Thermostat Housing Cover

Gates Coolant Outlet Cover for OE-Style Cooling Repair

The Gates Coolant Outlet CO34931 is an engine coolant thermostat housing cover built for direct-fit cooling system service. It combines a cast aluminum housing with a 180 degree F thermostat and seal, giving you the core components needed for a clean thermostat cover replacement on select Ford, Mazda, and Mercury vehicles.

Gates Coolant Outlet parts are part of the brand’s coolant outlet line, which focuses on OE-style fit and function with coverage that ranges from water outlets to complete thermostat housing assemblies. CO34931 is engineered to match original design requirements while addressing common aftermarket material and fit concerns.

Key Features

• Brand: Gates Coolant Outlet
• Part number: CO34931
• Engine coolant thermostat housing cover / thermostat cover
• Cast aluminum construction
• 180 degree F thermostat with seal included
• OE exact fit designation
• 2 bolt holes
• Outlet inside diameter: 1.26 in
• Outlet outside diameter: 1.48 in

Vehicle Fitment

• Fits 2009-2012 Ford Escape, N/A; thermostat cover; 180 degree; seal included; coolant outlet.
• Fits 2010-2012 Ford Fusion, N/A; thermostat cover; 180 degree; seal included; coolant outlet.
• Fits 2009-2011 Mazda Tribute, N/A; thermostat cover; 180 degree; seal included; coolant outlet.
• Fits 2009-2011 Mercury Mariner, N/A; thermostat cover; 180 degree; seal included; coolant outlet.
• Fits 2010-2011 Mercury Milan, N/A; thermostat cover; 180 degree; seal included; coolant outlet.

What This Part Helps Address

• Coolant leaks at the thermostat housing cover
• Cracked or warped plastic-style outlet housings
• Improper thermostat sealing at the outlet
• Cooling system service on OE-style applications
• Fitment issues from low-quality aftermarket replacements

Installation Notes and Tips

Confirm the original housing style, outlet dimensions, and bolt-hole layout before installation. This application is listed as a thermostat cover with a 180 degree F thermostat and seal included, and the fitment notes identify the covered Ford Escape, Ford Fusion, Mazda Tribute, Mercury Mariner, and Mercury Milan applications. Use proper cooling-system service procedures, refill with the correct coolant, and verify there are no leaks after installation.

Quality Assurance

Gates positions this coolant outlet line as an OE-style replacement solution designed to fit and perform like the original while supporting long service life. This part cross-references Dorman OE Solutions 902-1106 for the same application.