Gates CO34979 Engine Coolant Thermostat Housing Cover

Gates Coolant Outlet Thermostat Cover

The Gates Coolant Outlet line provides a direct-fit thermostat housing cover solution for select Ford, Mercury, Mazda, and Lincoln applications. This Gates CO34979 thermostat cover is built from plastic and includes a seal for a clean coolant outlet repair on vehicles such as the Ford Fusion, Ford Escape, and Mazda 6.

Key Features

• Brand: Gates Coolant Outlet
• Part number: CO34979
• Part type: Engine coolant thermostat housing cover
• Material: Plastic
• Type: Thermostat cover
• Outlet inside diameter: 1.28 in.
• Outlet outside diameter: 1.48 in.
• Bolt hole quantity: 3
• Contents: Thermostat cover and seal
• By-pass holes: No
• OE-style fit and function for listed applications

Product Details

Gates Coolant Outlets are engineered to address common material and design issues found in many aftermarket cooling system parts. The CO34979 is a thermostat housing cover that follows original-style dimensions and mounting points for the listed vehicles, helping restore proper coolant routing at the thermostat housing. This part cross-references Dorman OE Solutions 902-1105 for the same application.

Compatible With 2006-2009 Ford Fusion, N/A; 2006-2009 Mercury Milan, N/A; 2001-2008 Ford Escape, N/A; 2003-2008 Mazda 6, N/A; 2008 Mazda Tribute, N/A; 2001-2006 Mazda Tribute, N/A; 2005-2008 Mercury Mariner, N/A; 2006 Lincoln Zephyr, N/A; and 2002-2006 Mazda MPV, N/A. The Gates CO34979 is a practical replacement when the original thermostat cover is cracked, warped, or leaking at the coolant outlet.

Common Repair Uses

• Coolant seepage at the thermostat housing cover
• Cracked or brittle plastic coolant outlet housing
• Warped sealing surface causing coolant loss
• Failed thermostat cover seal at the housing
• Restoring proper coolant flow on Ford Fusion, Ford Escape, and Mazda 6 applications

Installation Notes

Verify the outlet diameter, bolt-hole count, and vehicle application before installation. Clean the mating surface thoroughly and inspect the thermostat housing and adjacent cooling components for wear, corrosion, or damage. Use the included seal during assembly and follow the vehicle manufacturer’s cooling system service procedure, including proper coolant refill and air bleeding.

Quality Assurance

Gates positions the Coolant Outlet line as a cost-effective replacement for common aftermarket cooling system issues, with coverage designed to match original fit and performance expectations for the listed applications.