Ensure your semi is Ready for the Road Ahead with proper engine cooling in a complete range of temperatures, with the Horton Polarforce 2-Speed Fan Clutch Conversion Kit. To maintain a functional engine temperature, this replacement component controls the operation of the engine cooling fan by applying or removing power as needed. Fashioned with an easy-to-install body that quietly works to cool the engine. FleetPride is your First Click in Heavy Duty .