Four Seasons 37377 Engine Cooling Fan Temperature Switch

Engine Cooling Fan Temperature Switch for OE-Style Control

Four Seasons 37377 is an engine cooling fan temperature switch built for temperature-based fan control in select Ford, Mercury, and Mazda applications. It uses a single male terminal and an engine/radiator-mounted design to trigger cooling fan operation at the specified temperature range.

The Four Seasons Temperature Switch line focuses on direct-fit thermal control components for cooling system service. This part is a temperature-style switch that meets or exceeds OEM requirements and is specified for engine/radiator mounting locations.

Key Features

• Part number: 37377
• Engine cooling fan temperature switch
• Single terminal, male connector
• Engine/radiator mounted design
• Temperature on: 206
• Temperature off: 197
• Meets or exceeds OEM requirements
• Cooling fan type switch for thermal fan control

Detailed Product Overview

This Four Seasons 37377 temperature switch monitors coolant temperature and signals the cooling fan circuit when the engine reaches the activation point. It is used in applications such as 1986-1991 Mazda 626, 1986-1988 Mazda RX-7, 1988-1993 Ford Festiva, 1989 Ford Probe, 1987-1988 Mercury Tracer, and 1991-1994 Mercury Capri. The part number 37377 is also cross-referenced to A03777 and TU204 for the same application.

For buyers searching for a Mazda 626 cooling fan temperature switch, Ford Festiva engine cooling fan switch, or Mercury Capri radiator-mounted temperature switch, this component provides the specified thermal switching range and OE-style fitment.

What It Helps Address

• Cooling fan not switching on at the correct temperature
• Cooling fan staying on longer than expected after warm-up
• Temperature-related fan control faults
• Radiator or engine-mounted switch replacement needs
• Service issues on older Ford, Mercury, and Mazda cooling systems

Installation Notes and Tips

Install the switch in the engine or radiator mounting location specified for the vehicle application. Confirm the connector style is male and verify the terminal count matches the original part before installation. Use the vehicle service information to check the activation and deactivation temperatures for the cooling fan circuit.

Compatible With 1991-1994 Mercury Capri, N/A; 1988-1993 Ford Festiva, N/A; 1986-1991 Mazda 626, N/A; 1989 Ford Probe, N/A; 1986-1988 Mazda RX-7, N/A; 1987-1988 Mercury Tracer, N/A; and 1985 Mazda 626, N/A.

Quality Assurance

Four Seasons lists this part as meeting or exceeding OEM requirements, supporting OE-style replacement standards for cooling system service.