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Variable Speed Controller with Stainless Steel Temperature Probe

Quick Overview

Flex-a-lite® Variable Speed Controller.


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.

  • Stainless steel temperature probe
  • 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: 31165-99943.pdf
YouTube Installation Video:

Additional Information

SKU 123241
Legacy Model Number 31165
Model No
Fitment Notes No
Displacement CID No