Hypertech Fan Switch

Hypertech Cool Fan Switches are designed to work with Hypertech ThermoMaster Power Chips and in any application where the is cooling fan controlled by a fan switch. In some vehicles, the electric cooling fans are controlled by the computer chip, but in others, the cooling fans are controlled by the fan switch (which is usually set to turn on at about 220 degrees F). TPI equipped Chevrolet engines that have two fans use a fan switch for one fan, and the other is controlled by the computer chip.