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Home >> Mazda >> 2015 >> 5 Touring >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Refrigerant System >> Refrigerant System Performance Test
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Refrigerant System Performance Test

  1. Inspect the refrigerant pressure. (See REFRIGERANT PRESSURE CHECK .)
  2. Place a dry-bulb thermometer in the driver-side center ventilator outlet.
    Fig 1: Placing Dry-Bulb Thermometer In Driver-Side Center Ventilator Outlet
    G08150873Courtesy of MAZDA MOTORS CORP.
  3. Start the engine and after it is warmed up, run it at a constant 1, 500 RPM  .
  4. Set the fan speed to MAX HI.
  5. Turn the A/C switch on.
  6. Set to RECIRCULATE mode.
  7. Set the temperature control to MAX COLD.
  8. Set to VENT mode.
  9. Close all the doors and windows.
  10. Wait until the air conditioner output temperature stabilizes.

    Stabilized condition 

    • The A/C compressor repeatedly turns on and off at regular intervals.
  11. After the blower air is stabilized, read the dry-bulb thermometer.
  12. Verify the ambient temperature.
  13. Verify that the temperature reading is in the shaded zone.
    Fig 2: Center Ventilator Temperature To Ambient Temperature Resistance Graph
    G08150874Courtesy of MAZDA MOTORS CORP.
    • If the there is any malfunction, inspect the refrigerant system according to the troubleshooting chart.
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