Coolant Fan Switch

When the coolant reaches a specified temperature, this switch turns on the vehicle’s coolant fan, which draws air through the radiator to regulate engine temperature.

  • Bi-metal disc expands when heated, activating snap-action electrical contact to transfer electrical signal to fan controller 

  • Factory-calibrated to make electrical contact at the specified lower temperature set point 

  • Calibrated and tested to confirm switch actuation at their specified temperature