2003 - 2009 Dodge Ram 2500 L6 5.9L Cummins Turbo-Diesel. 2003 - 2009 Dodge Ram 3500 L6 5.9L Cummins Turbo-Diesel. New AC A/C Condenser Parallel Flow. Condenser changes the phase of the refrigerant from gas to liquid and expels heat removed from the freon.