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Charging New R-134a Refrigerant

WARNING: This page is about a different car, the 2004 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.
  1. Open the valve of the refrigerant tank.
  2. Weigh the refrigerant tank to charge the suitable amount of refrigerant.
    WARNING:
    • If the refrigerant system is charged with a large amount of refrigerant when inspecting for gas leakage, and if any leakage should occur, the refrigerant will be released into the atmosphere. In order to prevent the accidental release of refrigerant which can destroy the ozone layer in the stratosphere, follow the proper procedures and charge with only a small amount of refrigerant when inspecting for gas leakage.
    • If charging the system with refrigerant using service cans, running the engine with the high-pressure side valve open is dangerous. Pressure within the service cans will increase and the cans could explode, scattering metal fragments and liquid refrigerant that can seriously injure you. Therefore, do not open the high-pressure side valve while the engine is running.
    CAUTION:
    • Always being charging of refrigerant from the high-pressure side. If changing is begun from the low-pressure side, the vanes of the A/C compressor will not be released and abnormal noise may result.
  3. Open the high-pressure side valve of the manifold gauge.
    Fig 1: Charging New Refrigerant
    G00975533Courtesy of MAZDA MOTORS CORP.
  4. When the low-pressure side reading increases to 0.098 MPa {1.0 kgf/cm 2  , 14 psi},  close the high-pressure side valve of the manifold gauge.
  5. Inspect for leakage from the cooler pipe/hose connections using a gas leak tester.
    • If there is no leakage, go to Step  7.
    • If leakage is found at a loose joint, tighten the joint, then go to the next step.
  6. Inspect for leakage again.
    • If there is no leakage after tightening the joint, go to the next step.
    • If there is still a leakage at the same joint, discharge the refrigerant and then repair the joint. Repeat the charging procedure from evacuation.
      Fig 2: Verifying Manifold Gauge Readings & Closing All Valves
      G00975534Courtesy of MAZDA MOTORS CORP.
      WARNING:
      • If charging the system with refrigerant using service cans, running the engine with the high-pressure side valve open is dangerous. Pressure within the service cans will increase and the cans could explode, scattering metal fragments and liquid refrigerant that can seriously injure you. Therefore, do not open the high-pressure side valve while the engine is running.
  7. Open the high-pressure side valve of the manifold gauge and charge with refrigerant until the weight of refrigerant tank has decreased 238-263 g {8.40-9.28 oz}  from the amount in Step  2.
    Fig 3: Opening High-Pressure Side Valve Of Manifold Gauge & Charge With Refrigerant
    G00975535Courtesy of MAZDA MOTORS CORP.
  8. Close the low-pressure side valve of the manifold gauge.
    WARNING:
    • If charging the system with refrigerant using service cans, running the engine with the high-pressure side valve open is dangerous. Pressure within the service cans will increase and the cans could explode, scattering metal fragments and liquid refrigerant that can seriously injure you. Therefore, do not open the high-pressure side valve while the engine is running.
    Fig 4: Closing Manifold Gauge Low-Pressure Side Valve
    G00975536Courtesy of MAZDA MOTORS CORP.
  9. Start the engine and actuate the A/C compressor.
  10. Open the low-pressure side valve of the manifold gauge and charge with refrigerant until the weight of the refrigerant tank has decreased regular amount from the amount in Step  2.
  11. Close the low-pressure side valve of the manifold gauge and the valve of the refrigerant tank.
  12. Stop the engine and A/C compressor.
    Fig 5: Opening Low-Pressure Side Valve Of Manifold Gauge & Charge With Refrigerant
    G00975537Courtesy of MAZDA MOTORS CORP.
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