Four Seasons 37490 Engine Cooling Fan Temperature Switch

Four Seasons 37490 Temperature Switch

Four Seasons 37490 is an engine cooling fan temperature switch built for radiator-mounted temperature control. It uses an oval connector with 2 male terminals and is listed as a system-mount temperature switch that meets or exceeds OEM requirements.

The Temperature Switch product line from Four Seasons focuses on direct-fit thermal control components for cooling and HVAC-related service needs. This part number, 37490, is specified for applications where accurate temperature-based switching is required at the radiator mount.

Key Features

• Engine cooling fan temperature switch for radiator mount applications
• Oval connector shape with 2 male terminals
• System mount design
• Temperature-style switch construction
• Meets or exceeds OEM specifications
• Four Seasons part number 37490

Detailed Description

Four Seasons 37490 is a temperature switch used in cooling system control circuits to respond to coolant temperature changes at the radiator. It is built with an oval, 2-terminal male connector and is identified as a radiator-mount, system-mount temperature switch. For buyers searching for a Toyota Highlander temperature switch, Toyota Avalon cooling fan switch, or Lexus RX300 radiator temperature switch, this part number 37490 matches the listed applications and connector style.

This part cross-references A03890 and SW3009 for the same application.

What It Helps Address

• Cooling fan not switching on at the correct temperature
• Cooling fan running at the wrong time
• Temperature signal interruption at the radiator mount
• Faulty thermal control in the cooling circuit
• Replacement needs for a worn engine cooling fan temperature switch

Installation Notes and Tips

• Verify the connector shape, terminal count, and male terminal layout before installation.
• Confirm radiator-mount placement and system-mount configuration match the original part.
• Check the vehicle’s cooling system condition and electrical connector condition during replacement.
• Use the listed fitment to confirm application by year, make, and model before ordering.

Quality Assurance

Four Seasons states that this part meets or exceeds OEM requirements. Confirm fitment for 2000-2004 Toyota Avalon, 1999-2003 Lexus RX300, 2001-2003 Toyota Sienna, 2001-2007 Toyota Highlander, and 2002 Lexus ES300 before installation.