HomeBelts and Cooling > SwitchesFour Seasons 37490 Engine Cooling Fan Temperature Switch
Part #: 37490

Four Seasons 37490 Engine Cooling Fan Temperature Switch

Temperature Switch
⚙️ 21 vehicles fit this part
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Select your vehicle to confirm fitment
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OE Direct Replacement — Bolt-on fit, no modifications needed
📦Temperature Switch
🚗Fitment: Toyota and Lexus, Highlander, Avalon, RX300, Sienna, and ES300
🔄Easy Returns — Return within 60 days for a full refund
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Overview of Four Seasons Engine Cooling Fan Temperature Switch

The Four Seasons Temperature Switch part number 37490 is designed to regulate engine cooling fan operation by monitoring temperature levels. This switch is compatible with select Lexus and Toyota models, including Avalon, ES300, Highlander, RX300, and Sienna, ensuring precise temperature control for optimal engine performance.

  • Oval-shaped male connector for secure electrical connection
  • Two-terminal design for reliable signal transmission
  • Engine cooling fan temperature switch mounted on the radiator
  • Meets or exceeds original equipment manufacturer (OEM) specifications
  • System mount location for accurate temperature sensing
  • Part of the Four Seasons Temperature Switch product line

Detailed Product Description

The Four Seasons Temperature Switch 37490 functions as a temperature-activated switch that controls the engine cooling fan based on radiator temperature. Featuring an oval-shaped male connector with two terminals, this switch ensures a stable and efficient electrical connection within the cooling system. It is designed for system mount installation, typically on the radiator, to provide accurate temperature readings and timely fan activation. This part meets or exceeds OEM standards, making it a dependable replacement for the engine cooling fan temperature switch in compatible Lexus and Toyota vehicles.

The Temperature Switch product line from Four Seasons focuses on precision temperature control components that maintain engine cooling efficiency. This line includes switches engineered to fit specific vehicle applications, such as the 37490, which is tailored for select Lexus and Toyota models. By integrating seamlessly with the vehicle’s cooling system, these switches help maintain optimal engine temperatures and prevent overheating.

Common Applications and Issues Addressed

  • Regulates engine cooling fan activation based on radiator temperature
  • Prevents engine overheating by ensuring timely fan operation
  • Replaces faulty or malfunctioning temperature switches in Lexus Avalon, ES300, Highlander, RX300, and Toyota Sienna
  • Resolves intermittent fan operation or failure to engage
  • Maintains proper engine temperature for improved performance and longevity

Installation Notes and Tips

  • Ensure the vehicle is cool before attempting installation to avoid burns
  • Disconnect the battery to prevent electrical shorts during replacement
  • Locate the existing temperature switch on the radiator or system mount area
  • Carefully disconnect the oval-shaped male connector with two terminals
  • Install the new Four Seasons Temperature Switch 37490 securely and reconnect the terminals
  • Test the cooling fan operation after installation to confirm proper function

Quality Assurance and Warranty

The Four Seasons Temperature Switch 37490 is manufactured to meet or exceed OEM specifications, ensuring reliable performance and durability. This part undergoes rigorous quality control to maintain consistent standards. While specific warranty details may vary, Four Seasons typically offers coverage against defects in materials and workmanship. Consult product documentation or the manufacturer for exact warranty terms.

BrandFour Seasons
Part Number37490
PositionTemperature Switch
Connector GenderMale
Connector ShapeOval
DescriptionSwitch-Temp /Radiator Mount
Functiontemperature switch
Meets / Exceeds OEM?YES
Mnt Sys LocSystem Mount
StyleTemperature
Terminal Quantity2
TypeTemperature

This part fits 21 vehicles. Search below:

YearMakeModelPositionNotes
2007ToyotaHighlanderN/AHVAC Blower Motor Resistor Harness with 2 terminals; Temperature Switch
2006ToyotaHighlanderN/AHVAC Blower Motor Resistor Harness with 2 terminals; Temperature Switch
2005ToyotaHighlanderN/AHVAC Blower Motor Resistor Harness with 2 terminals; Temperature Switch
2004ToyotaAvalonN/ATemperature Switch
2004ToyotaHighlanderN/AHVAC Blower Motor Resistor Harness with 2 terminals; Temperature Switch
2003LexusRX300N/ATemperature Switch
2003ToyotaAvalonN/ATemperature Switch
2003ToyotaHighlanderN/AHVAC Blower Motor Resistor Harness with 2 terminals; Temperature Switch
2003ToyotaSiennaN/ATemperature Switch
2002LexusES300N/ATemperature Switch
2002LexusRX300N/ATemperature Switch
2002ToyotaAvalonN/ATemperature Switch
2002ToyotaHighlanderN/AHVAC Blower Motor Resistor Harness with 2 terminals; Temperature Switch
2002ToyotaSiennaN/ATemperature Switch
2001LexusRX300N/ATemperature Switch
2001ToyotaAvalonN/ATemperature Switch
2001ToyotaHighlanderN/AHVAC Blower Motor Resistor Harness with 2 terminals; Temperature Switch
2001ToyotaSiennaN/ATemperature Switch
2000LexusRX300N/ATemperature Switch
2000ToyotaAvalonN/ATemperature Switch
1999LexusRX300N/ATemperature Switch

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

374908942821010A03890SW3009

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.