Gates 33958 Engine Coolant Thermostat

Integrated Housing Thermostat for Ford Super Duty Cooling Control

Gates 33958 is an integrated housing thermostat built for precise engine temperature regulation in applications that use a combined thermostat and housing design. It helps maintain the correct operating temperature for consistent cooling-system performance in Ford E-350 Super Duty, F-250 Super Duty, F-350 Super Duty, E-350 Club Wagon, and Excursion models.

Key Features

• Integrated Housing Thermostat design for OE-style cooling-system service
• Start-to-open temperature: 192°F / 89°C
• Outlet inside diameter: 1.476 in.
• Outlet outside diameter: 1.751 in.
• 2 bolt holes for mounting
• Jiggle pin weep hole: Yes
• Jiggle pin/check valve: Yes
• 1 seal included in the design
• OE Performance rating
• Non-electric thermostat construction

Product Details

The Gates Integrated Housing Thermostat line focuses on accurate temperature control in modern cooling systems that use an integrated housing layout. Gates applies its aftermarket thermostat development to provide an OE-style alternative for vehicles that require a thermostat and housing assembly rather than a standalone thermostat. Part number 33958 is specified for 192-degree operation and is listed for 2003-2010 Ford truck and van applications with the correct housing configuration.

This part cross-references Motorad 510-192 and Timken 30309 for the same application.

What It Helps Address

• Engine running too cool or too warm
• Delayed warm-up after cold starts
• Temperature fluctuation from a worn thermostat assembly
• Cooling-system service on Ford E-350 Super Duty, F-250 Super Duty, and F-350 Super Duty models
• Replacement needs for integrated thermostat housing designs

Installation Notes and Tips

• Verify the housing style, outlet dimensions, and 2-bolt mounting pattern before installation.
• Confirm the 192°F / 89°C temperature specification matches the vehicle application.
• Inspect the sealing surface and cooling passages during service to help prevent leaks.
• Bleed air from the cooling system after installation to restore normal coolant flow.
• Use the vehicle’s service procedure for torque and refill specifications.

Quality Assurance

Gates positions this integrated thermostat housing line as an OE-performance replacement solution for vehicles using integrated thermostat assemblies. The design is built around accurate temperature regulation and control, supporting consistent cooling-system operation in the listed Ford applications. Gates 33958 is a direct-fit service part for the specified fitments, including 2003-2007 Ford F-250 Super Duty, 2003-2007 Ford F-350 Super Duty, and 2004-2010 Ford E-350 Super Duty.