Four Seasons 37303 Engine Cooling Fan Switch

Temperature Switch for Engine Cooling Control

The Four Seasons Temperature Switch 37303 is an engine-mounted coolant fan switch built for temperature-based fan operation. It uses a male 3/8" pipe fitting and a single-terminal, black connector with an open shape for direct integration into the cooling system.

Compatible with 1987-1993 Ford Mustang applications, this engine cooling fan switch is specified to meet or exceed OEM requirements. The Four Seasons 37303 is a direct-fit temperature switch for vehicles that rely on an engine-mounted fan control signal at 219 degrees.

Key Features

• Brand: Four Seasons Temperature Switch
• Part number: 37303
• Engine-mounted cooling fan switch
• Temperature on point: 219 degrees
• Male 3/8" pipe thread fitting
• Single-terminal design with black open connector
• Meets or exceeds OEM requirements
• Compatible with 1987-1993 Ford Mustang, engine mounted coolant fan switch

Product Details

The Four Seasons 37303 is part of the Temperature Switch line, focused on temperature-actuated engine cooling control. This switch is designed for applications where the fan circuit is triggered by coolant temperature at the engine mount location. For Ford Mustang cooling system service, it provides the correct thread size, connector style, and operating temperature specification for the listed fitment.

This part cross-references Wix 51741 for the same application. The Four Seasons 37303 also cross-references OE-style numbers used in the same engine cooling fan switch application.

Common Issues This Part May Address

• Cooling fan not switching on at the specified temperature
• Fan cycling problems caused by a failed temperature switch
• Overheating concerns tied to incorrect fan activation
• Intermittent engine cooling fan operation
• Replacement needs for a worn engine-mounted coolant fan switch

Installation Notes and Tips

Verify the thread size, connector style, and temperature specification before installation. This switch uses a male fitting with 3/8" pipe thread and an open black connector with one terminal. Confirm the vehicle uses an engine-mounted coolant fan switch and match the listed Ford Mustang year range before replacement.

Quality Assurance

Four Seasons states that this part meets or exceeds OEM requirements for the listed application. Use the confirmed fitment data for 1987-1993 Ford Mustang, engine mounted coolant fan switch, when selecting this temperature switch.