Gates 33909 Engine Coolant Thermostat

OE Type Thermostat for Ford Cooling Systems

The Gates OE Type Thermostat 33909 is built for precise coolant temperature control and an OEM-equivalent fit. It is a direct replacement thermostat for select Ford trucks and vans, including Ford E-350 Super Duty, Ford Excursion, Ford F-250 Super Duty, and Ford F-350 Super Duty applications with 195-degree OE temperature requirements.

Key Features

• OE Type Thermostat for factory-style temperature regulation
• Start-to-open temperature: 192°F / 89°C
• Bottom by-pass design for the listed Ford cooling systems
• Steel and copper construction for durable service
• O-ring seal type for leak-resistant installation
• Jiggle pin weep hole included for air bleeding during fill
• OE Performance comparison rating

Product Details

Gates OE Type Thermostat 33909 is engineered for vehicles that require stable coolant flow and accurate warm-up control. The thermostat uses a bottom by-pass design, a steel and copper body, and an O-ring seal to match the original-style fit and function expected in OE service. This part number is commonly searched as Gates 33909 thermostat and is also referenced as Four Seasons 33909 for the same application. For buyers servicing Ford E-350 Super Duty, Ford Excursion, or Ford F-250 Super Duty cooling systems, this thermostat supports factory temperature control without changing the original cooling strategy.

Vehicle Fitment

• Fits 2003 Ford E-350 Club Wagon, N/A; 195 Degree; OE Temperature; OE Type Thermostat
• Fits 1999-2003 Ford E-350 Super Duty, N/A; 195 Degree; OE Temperature; OE Type Thermostat
• Fits 2000-2003 Ford Excursion, N/A; 195 Degree; OE Temperature; OE Type Thermostat
• Fits 1999-2003 Ford F-250 Super Duty, N/A; 195 Degree; OE Temperature; OE Type Thermostat
• Fits 1999-2003 Ford F-350 Super Duty, N/A; 195 Degree; OE Temperature; OE Type Thermostat
• Fits 1996-2002 Ford E-350 Econoline Club Wagon, N/A; 195 Degree; OE Temperature; OE Type Thermostat
• Fits 1996-1998 Ford E-350 Econoline, N/A; 195 Degree; OE Temperature; OE Type Thermostat
• Fits 1997 Ford F-250 HD, N/A; 195 Degree; OE Temperature; OE Type Thermostat
• Fits 1996-1997 Ford F-350, N/A; 195 Degree; OE Temperature; OE Type Thermostat
• Fits 1996 Ford F-250, N/A; 195 Degree; OE Temperature; OE Type Thermostat

Common Cooling Issues Addressed

• Engine running too cool or taking too long to reach operating temperature
• Temperature swings caused by a worn thermostat
• Coolant flow problems related to a sticking thermostat valve
• Leak concerns from an aging thermostat seal
• Air pockets during cooling system service, helped by the jiggle pin weep hole

Installation Notes

Verify the OE temperature requirement and housing style before installation. Clean the sealing surfaces thoroughly, inspect the thermostat housing, and replace any damaged coolant hoses or gaskets as needed during service. This thermostat uses an O-ring seal and does not include an installation tool.

Quality Assurance

Gates OE Type Thermostats are built to deliver OEM-equivalent fit and consistent temperature control for service replacement use. The 33909 part number is a direct OE-style solution for the listed Ford applications, including Ford E-350 Super Duty, Ford Excursion, and Ford F-250 Super Duty cooling systems.