AC–78 AIR CONDITIONING SYSTEM – REFRIGERANT LINES REFRIGERANT LINES TIGHTENING TORQUE OF REFRIGERATION LINES Receiver Evaporator Expansion Valve Condenser Compressor N11373 ON–VEHICLE INSPECTION 1. INSPECT HOSES AND TUBES FOR LEAKAGE Using a gas leak tester, check for leakage of refrigerant. 2. INSPECT HOSE AND TUBE CONNECTIONS FOR LOOSENESS