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Section 41 (Air Conditioning System (Service Information)): Refrigerant: Replacement: Replacement

WARNING: This page is about a different car, the 2012 Lexus CT 200h. However, it is still accessible from the selected car via links, so may be relevant.
  1. RECOVER REFRIGERANT FROM AIR CONDITIONING SYSTEM 
    1. Turn the A/C switch on.
    2. Operate the air conditioning with a set temperature of 25°C (77°F) and the blower at low for 10 minutes to circulate the refrigerant. This causes most of the compressor oil from the various components of the air conditioning system to collect in the air conditioning compressor.
    3. Turn the power switch off.
    4. Recover the refrigerant from the air conditioning system using a refrigerant recovery unit.
  2. CHARGE AIR CONDITIONING SYSTEM WITH REFRIGERANT 
    1. Perform vacuum purging using a vacuum pump or appropriate equipment.
    2. Charge the air conditioning system with refrigerant.

      Refrigerant type

      HFC-134a (R134a)

      Fig 1: Identifying Air Conditioning System With Refrigerant Graph
      GTY355844Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard charge amount

      470 g (16.6 oz.)

      • SST: 09985-20010 
        • 09985-02010
        • 09985-02050
        • 09985-02060
        • 09985-02070
        • 09985-02080
        • 09985-02090
        • 09985-02110
        • 09985-02130
        • 09985-02140
        • 09985-02150
      NOTE:
      • Do not turn the A/C switch on before charging the air conditioning system with refrigerant. Doing so may cause the compressor to work without refrigerant, resulting in overheating of the compressor.
      • Approximately 100 g (3.53 oz.) of refrigerant may need to be added after the bubbles in the sight glass disappear. The refrigerant amount should be checked by quantity (weight), not with the sight glass.
      • If at all possible, avoid using a manifold gauge set or recovery and recycling unit that has been used for vehicles with conventional compressor oil (ND-OIL 8 or equivalent). If either of these is used, conventional compressor oil remaining in the equipment will enter the air conditioning system of the vehicle, resulting in electrical insulation performance deterioration. A manifold gauge set that has been used 3 times or less can be used if an appropriate one is not available.

      HINT: 

      Ensure that sufficient refrigerant is available to recharge the system when using a refrigerant recovery unit. Refrigerant recovery units are not always able to recover 100% of the refrigerant from an air conditioning system.

  3. WARM UP COMPRESSOR 
    1. Keep the A/C switch on for at least 2 minutes to warm up the compressor.
      NOTE:

      To prevent damage to the compressor, be sure to warm up the compressor when turning the air conditioning on after removing and installing air conditioning system lines (including the compressor).

  4. INSPECT FOR REFRIGERANT LEAK 
    1. After recharging the air conditioning system with refrigerant, inspect for refrigerant leaks using a halogen leak detector.
    2. Carry out the test under the following conditions:
      • Power switch off.
      • Secure good ventilation (the halogen leak detector may react to volatile gases which are not refrigerant, such as gasoline vapor and exhaust gas).
      • Repeat the inspection 2 or 3 times.
      • Measure the pressure to make sure that there is some refrigerant remaining in the air conditioning system.

        Pressure when the compressor is off: approx. 392 to 588 kPa (4.0 to 6.0 kgf/cm2, 57 to 85 psi)

    3. Using a halogen leak detector, inspect for refrigerant leaks from the air conditioning system.
      Fig 2: Identifying Halogen Leak Detector
      GTY318630Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 Halogen Leak Detector
      *a Inspect for Leak
    4. Bring the halogen leak detector close to the drain hose with the detector power off, and then turn the detector on.
      Fig 3: Identifying Halogen Leak Detector And Drain Hose
      GTY248226Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 Halogen Leak Detector
      *2 Drain Hose

      HINT: 

      • After the blower motor has stopped, leave the cooling unit for more than 15 minutes.
      • Bring the halogen leak detector sensor under the drain hose.
      • When bringing the halogen leak detector close to the drain hose, make sure that the halogen leak detector does not react to volatile gases. If it is not possible to avoid interference from volatile gases, the vehicle should be lifted up to allow checking for leaks.
    5. If a refrigerant leak is not detected from the drain hose, remove the blower motor control from the cooling unit. Insert the halogen leak detector sensor into the unit and check for a leak.
    6. Disconnect the pressure sensor connector and leave it for approximately 20 minutes. Bring the halogen leak detector close to the pressure sensor and check for a leak.

      HINT: 

      When checking for leaks, the presence of oily dirt at a joint can indicate a leak.

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