Four Seasons 37304 Engine Cooling Fan Switch

Engine Cooling Fan Switch for OE-Style Temperature Control

Four Seasons Temperature Switch 37304 is an engine-mounted cooling fan switch built for direct temperature-based fan control. It uses a male oval connector, a single terminal, and a 3/8" pipe thread size for applications that call for this style of coolant fan temperature switch.

Compatible With Ford Escort, Mercury Tracer, Mazda Protege, Mazda 323, Mazda Miata, Mazda MX-3, Mazda 626, Mazda MX-6, Mazda RX-7, Ford Probe, and Kia Sephia applications that use an engine-mounted temperature switch. Four Seasons 37304 is also a direct cross-reference for OE-style replacement needs in these cooling systems.

• Engine-mounted cooling fan switch for temperature-based fan operation
• Open fan design with 197°F off and 206°F on temperature points
• Male connector with oval shape and 1 terminal
• 3/8" pipe thread fitting size, 43/64" x 18 thread specification
• Meets or exceeds OEM requirements

Product Details and Fitment

This Four Seasons Temperature Switch line focuses on accurate thermal switching for cooling fan circuits. Part number 37304 is specified as a temperature switch for engine-mounted use, making it a direct match for vehicles that rely on a threaded coolant fan switch at the engine or thermostat housing. It is listed for 1989-1997 model-year coverage across Ford, Mercury, Mazda, and Kia applications, including 1991-1996 Ford Escort, 1991-1996 Mercury Tracer, 1991-1993 Mazda Miata, and 1994-1997 Kia Sephia.

This part cross-references 0N35018840 and FO2Z10884C for the same application.

What It Helps Address

• Cooling fan not switching on at the correct temperature
• Cooling fan staying on longer than expected after warm-up
• Intermittent fan operation caused by a worn temperature switch
• Incorrect coolant fan cycling in engine-mounted switch systems
• Replacement needs for threaded thermostat housing or engine-mounted fan switch locations

Installation Notes and Tips

Verify the connector shape, terminal count, thread size, and temperature range before installation. This switch is intended for engine-mounted applications, so confirm the mounting location and thread specification match the original part on the vehicle. For best results, inspect the connector and surrounding cooling system components before replacing the switch.

Quality Assurance

Four Seasons lists this temperature switch as meeting or exceeding OEM requirements, supporting OE-style fit and function for the specified cooling fan applications.