Prepare your semi to be Ready for the Road Ahead , with the Kit Masters Remanufactured 2-Speed Fan Clutch that offers proper engine cooling in a complete range of temperatures. By utilizing a temperature-based design, this replacement component is able to control the operation of the engine's cooling fan by applying or removing power as needed. Constructed with an easy-to-install body that quietly works to cool the engine. FleetPride is your First Click in Heavy Duty .