Ensure your semi is Ready for the Road Ahead with proper engine cooling in a complete range of temperatures, with the Horton DM Advantage 2-Speed Fan Clutch Pack Assembly. Thanks to its 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. Crafted with an easy-to-install body that works to silently cool the engine. FleetPride is your First Click in Heavy Duty .