Gates CO34989 Engine Coolant Thermostat Housing Cover

Gates Coolant Outlet Thermostat Cover

The Gates Coolant Outlet CO34989 is an aluminum thermostat cover built for direct replacement service on select Ford, Lincoln, and Mercury applications. It includes a seal and is engineered to match original fit and function for the cooling system.

Gates Coolant Outlet is a product line focused on replacing common coolant outlet and thermostat housing components with parts that address material and design issues seen in many aftermarket alternatives. CO34989 follows that approach with OE-style fitment and long-service-life construction.

Key Features

• Aluminum thermostat cover for cooling system service
• Thermostat cover design with 2 bolt holes
• Outlet outside diameter: 1.5 in.
• Outlet inside diameter: 1.18 in.
• Includes seal
• Direct replacement style for original equipment applications
• Part number: CO34989

Detailed Description

This Gates thermostat housing cover is designed for vehicles that use a coolant outlet-style thermostat cover in the cooling system. The aluminum construction helps provide a durable replacement for worn, corroded, or damaged factory-style housings. It is listed for 1996-2004 Ford Mustang, 1996-1997 Ford Thunderbird, 1996-1997 Mercury Cougar, and 1996 Lincoln Mark VIII applications, with notes that include thermostat cover or thermostat housing cover usage and included seal details. If you are searching for a Ford Mustang thermostat cover replacement, Gates CO34989 offers a direct-fit cooling system solution. The CO34989 part number is also useful when cross-checking thermostat housing cover listings for these Ford, Lincoln, and Mercury models.

This part cross-references Dorman - OE Solutions 902-217 for the same application.

Common Problems This Part Can Address

• Cracked or warped thermostat housing cover
• Coolant seepage at the thermostat cover sealing surface
• Corrosion or deterioration in the original aluminum housing
• Improper sealing from a worn thermostat cover
• Cooling system service on a Ford Mustang, Thunderbird, Cougar, or Mark VIII

Installation Notes and Tips

Verify the outlet diameters, bolt-hole count, and vehicle application before installation. Clean the mating surfaces thoroughly so the included seal can seat correctly, and inspect the thermostat and adjacent cooling components while the housing is removed. Confirm fitment for your exact year and engine configuration before ordering CO34989.

Quality Assurance

Gates Coolant Outlets are developed as OE-style replacement components with full line coverage across coolant outlet and thermostat housing applications. The brand positions this line as a cost-effective replacement option built to fit and perform like the original part while supporting long service life.