Air Conditioning System: Charging

WARNING: This page is about a different car, the 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.

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
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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, if leak is found, repair the faulty component or connection.
  CAUTION: Use the refrigerant recovery/recycling machine to recover the refrigerant whenever replacing parts.
  
  Fig 2: Inspecting Refrigeration System For Leaks
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
CHARGE REFRIGERANT INTO REFRIGERANT SYSTEM
If there is no lead after refrigerant lead check, charge the proper amount of refrigerant into refrigeration system.
CAUTION:
- Never run the engine when charging the system through the high pressure side.
- Do not open the low pressure hand a valve when the system is being charged with liquid refrigerant.
1. Open the 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 bubbles.
3. Charge partially refrigeration system with refrigerant.
  
  Fig 3: Charging Refrigerant Into Refrigeration System
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. Set vehicle in these conditions:
    - Running engine at 1,500 RPM
    - Front A/C:
      1. Blower speed control switch at "HI" position
    - Dual A/C:
      1. Rear blower switch at "HI" position
    - A/C switch ON
    - Front A/C:
      1. Temperature control switch at "MAX. COOL" position
    - Dual A/C:
      1. Rear temperature control switch at "MAX. COOL" position
    - Fully open the doors
    - Air inlet control set at "RECIRC"
  2. Open the low pressure hand valve.
  CAUTION: Do not open the high pressure hand valve.
4. Charge refrigerant until bubbles disappear and check the pressure on the gauge through the sight glass.
  
  Fig 4: Identifying Properly Charged & Insufficiently Charged
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002