Equip your semi truck to be Ready for the Road Ahead , with the Dorman Blade Bolt-On Heavy Duty Climate Control Module, a key component that provides seamless climate control. By pairing directly with the HVAC system, this replacement module allows operators to efficiently control the internal climate in a vehicle's cabin. Manufactured with straightforward controls and a basic design to ensure a simple installation. FleetPride is your First Click in Heavy Duty .