Ensure your semi is Ready for the Road Ahead with proper engine cooling in a complete range of temperatures, with the Borg Warner Kysor Rear Air On/Off Fan Clutch. To maintain a functional engine temperature, this replacement component controls the operation of the engine cooling fan by applying or removing power as needed. Built with an easy-to-install body that works to silently cool the engine. FleetPride is your First Click in Heavy Duty .