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Variable Speed Controller with Thread-in Temperature Sensor

Quick Overview

The Flex-a-lite® Variable Speed Controller with thread-in temperature sensor.


The Flex-a-lite® Variable Speed Controller turns the electric fan on and off at the desired temperature. Fans turn on at 60-percent power and fan speed increases as the temperature rises. You can easily adjust the activation temperature between approximately 160-240 degrees Fahrenheit. It also turns the electric fan on when the vehicle air conditioner is engaged. Fan will run for up to 25 seconds after the vehicle is turned off.

  • Thread-in temperature sensor
  • Variable fan speed
  • 45 amp rating
  • 12-volt systems only

WARNING: This product can expose you to chemicals, including lead and phthalates, known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to

Installation Instructions

PDF Install Instructions: 31163-91163.pdf
YouTube Installation Video:

Additional Information

SKU 107012
Legacy Model Number 31163
Model No
Fitment Notes No
Displacement CID No

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