The Primatech 4-Terminal and 4-Speed Function A/C Blower Resistor is designed to provide improved cabin comfort with 4-Speed functions. This resistor is designed to optimize energy usage, so that the fan motor will not draw more current than necessary. It is compatible with Kenworth trucks applications and has a voltage of 12/24V. It is the perfect choice for your A/C blower needs. FleetPride is your First Click in Heavy Duty®.