front. w/o cool box. A/C Refrigerant Hose. Auxiliary HVAC. Exc.Cool Box. Pipe used to transport A/C Refrigerant between other A/C components. AC tube. Air Conditioning (A/C) Refrigerant Hose. Discharge. Evaporator tube. Inlet. Outlet. Pressure. Return. Suction. TUBE, Liquid, NO.1.