{"model":"mk4","model_name":"MK4 Supra","vehicle":"Toyota Supra A80 (1993–2002, 2JZ-GE / 2JZ-GTE)","document":"Repair Manual","section":"AC","section_name":"Air Conditioning","page":6,"pages_in_section":111,"title":"Precautions When Charging Refrigerant","section_header":"Air Conditioning System — General Description","ocr_text":"AC–6\nAIR CONDITIONING SYSTEM – GENERAL DESCRIPTION\n\nManifold\nGauge Valve\n\nVacuum\nQuick-Connectors Pump Switch\nN04352\n\nWrong    Okay\n\nLO  HI        LO  HI\n\nN61084\n\nCAUTION:\n• Be sure to connect both the high and low pressure quick–connectors onto the A/C system when evacuating. If only one side is connected, the system would be open to atmosphere through the other connector, making it impossible to maintain vacuum.\n• Be sure to turn off the manifold gauge valve immediately after evacuating the system. Then you may switch off the vacuum pump.\n\nPRECAUTIONS WHEN CHARGING REFRIGERANT\n1. DO NOT OPERATE COMPRESSOR WITHOUT ENOUGH REFRIGERANT IN REFRIGERANT SYSTEM\nIf there is not enough refrigerant in the refrigerant system, oil lubrication will be insufficient and compressor burnout may occur, so take care to avoid this.\n2. DO NOT OPEN HIGH PRESSURE MANIFOLD VALVE WHILST COMPRESSOR IS OPERATING\nIf the high pressure valve is opened, refrigerant flows in the reverse direction and could cause the charging cylinder to rupture, so open and close the low pressure valve only.\n3. BE CAREFUL NOT TO OVERCHARGE SYSTEM WITH REFRIGERANT\nIf refrigerant is overcharged, it causes problems such as insufficient cooling, poor fuel economy, engine overheating etc.\n\nSUPPLEMENTAL RESTRAINT SYSTEM (SRS)\nFailure to carry out service operations in the correct sequence could cause the supplemental restraint system to deploy, possibly leading to a serious accident.\nDuring removal or installation of the parts and the yellow wire harness and connector for the airbag is necessary, refer to the precautionary notices in the RS section before carrying out 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