REFRIGERANT(for HFC-134a(R134a)) REPLACEMENT

PROCEDURE


  1. RECOVER REFRIGERANT FROM REFRIGERATION SYSTEM


    1. Turn the power switch on (READY).

    2. Turn the A/C switch on.

    3. Operate the cooler compressor under the conditions shown below:

      Item Condition
      Engine Speed Idling
      Operating Time 3 minutes or more
      A/C Switch Status On
      Blower Switch Status HI
      Set Temperature MAX COOL

      This causes most of the compressor oil from the various components of the A/C system to be collected in the A/C compressor.

      Tech Tips

      It is not necessary to operate the cooler compressor if the A/C does not operate because of compressor lock etc.

    4. Turn the power switch off.

    5. Recover the refrigerant from the A/C system using a refrigerant recovery unit.

      Note

      Be sure to use a refrigerant recovery unit that is compatible with HFC-134a (R134a) systems.

      Tech Tips

      Use the refrigerant recovery unit in accordance with the manufacturer's instruction manual.

  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)
      A005CFJE01
      Text in Illustration
      *a Sub-cool System *b High Pressure
      *c Refrigerant Amount *d Standard charge amount
      *e Charge additional 50 to 150 g (1.77 to 5.29 oz.) *f Point where bubbles disappear
      *g Mean value in proper range *h Overcharged
      Standard charge amount
      440 to 500 g (15.6 to 17.6 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.

      • The refrigerant amount should be checked by quantity (weight).

      • 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 11 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.

      Tech Tips

      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 (3.9 to 5.9 kgf/cm2, 57 to 85 psi)

    3. A005E27E59
      Text in Illustration
      *1 Halogen Leak Detector
      *a Inspect for Leak

      Using a halogen leak detector, inspect for refrigerant leaks from the air conditioning system.

    4. A005CBLE04
      Text in Illustration
      *1 Halogen Leak Detector
      *2 Drain Hose

      Bring the halogen leak detector close to the drain hose with the detector power off, and then turn the detector on.

      Tech Tips


      • 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.

      Tech Tips

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