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Refrigerant System Performance Test

WARNING: This page is about a different car, the 2003 Mazda Protege5 and 2003 Mazda Protege. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform refrigerant pressure check. (See REFRIGERANT PRESSURE CHECK  .)
    • If they are correct, go to the next step.
    • If not as specified, troubleshoot refrigerant system. (See TROUBLESHOOTING INDEX .)
  2. Place a dry-bulb thermometer in the driver-side center ventilator outlet.
  3. Close the hood.
  4. Warm up the engine and run it at a constant 1,500 rpm.
  5. Set the fan switch to 4th position.
  6. Turn the A/C switch on.
  7. Set the RECIRCULATE mode.
  8. Set the temperature control to MAX COLD.
  9. Set the VENT mode.
  10. Close all the doors and all the windows.
  11. Wait until the air conditioner output temperature stabilizes. The output temperature is stable when the A/C compressor is repeatedly turned on and off based on the A/C compressor control of A/C amplifier.
  12. Record driver-side center ventilator temperature.
  13. Determine and record ambient temperature.
  14. Verify that the temperature reading is in the shaded zone.
    • If the performance is not within the shaded zone, troubleshoot the refrigerant system. (See TROUBLESHOOTING INDEX .)
    Fig 1: Center Ventilator Temperature And Ambient Temperature Graph
    G01914643Courtesy of MAZDA MOTORS CORP.
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