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Air Conditioning System: Charging

WARNING: This page is about a different car, the 2002 Lexus IS 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. Install Charging Cylinder 

    HINT:

    When handling the charging cylinder, always follow the directions given in the instruction manual.

    1. Charge the proper amount of refrigerant into the charging cylinder.
    2. Connect the center hose to the charging cylinder.
      CAUTION: Do not open both high and low hand valves of manifold gauge set.
    3. Open the valve of charging cylinder.
    4. Press the valve core on the side of manifold gauge and expel the air inside of the center hose.
    Fig 1: Installing Charging Cylinder & Associated Components
    G01178930Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Inspect Refrigeration System For Leaks 
    1. Open the high pressure hand valve and charge refrigerant.
    2. When the low pressure gauge indicates 98 kPa (1 kgf/cm2 , 14 psi) close the high pressure hand valve.
    3. Using a gas leak detector, check the system for leakage.
      Fig 2: Using Gas Leak Detector To Check System For Leakage
      G01178931Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    If leak is found, repair the faulty component or connection.

    CAUTION: Use the refrigerant recovery/recycling machine to recover the refrigerant whenever replacing parts.
  3. Charge Refrigerant Into Refrigeration System 

    If there is no leak after refrigerant leak check charge, the propel amount of refrigerant in to refrigeration system.

    CAUTION:
    • Never run the engine when charging the system through the high pressure side. 
    • Do not open the low pressure hand valve when the system is being charged with liquid refrigerant. 
    1. Open he high pressure hand valve fully.
    2. Charge specified amount of refrigerant, then close the high pressure hand valve.

      HINT:

      A fully charged system is indicated by the sight glass being free of any bubbles.

    3. Charge partially refrigeration system with refrigerant.
      1. (1) Set vehicle in these conditions:
        • Running engine at 1,500 RPM
        • Blower speed control set at "HI"
        • Temperature control set at "MAX. COOL" position
        • Air inlet control set at "RECIRC"
        • Fully open doors (Sliding roof: closed)
      2. (2) Open the low pressure hand valve.
        CAUTION: Do not open the high pressure hand valve.
        Fig 3: Identifying Low & High Pressure Service Valves
        G01178932Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. (3) Charge refrigerant until bubbles disappear and check the pressure on the gauge through the sight glass.
      Fig 4: Charging Refrigerant Until Bubbles Disappear
      G01178933Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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