Refrigerant System Performance Test

WARNING: This page is about a different car, the 2014 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

Measure the air conditioner output temperature after approx.10 min have elapsed from engine start.

Inspect the refrigerant pressure. (See REFRIGERANT PRESSURE CHECK .)
Place a dry-bulb thermometer in the driver-side center ventilator outlet.
Start the engine and warm it up.
Set the fan speed to MAX HI.
Turn the A/C switch on.
Set to RECIRCULATE mode.
Set the temperature control to MAX COLD.
Set to VENT mode.
Close all the doors and windows.
Maintain the engine speed at 1, 500 rpm.
Wait until the air conditioner output temperature stabilizes.
Stabilized condition
- The A/C compressor repeatedly turns on and off at regular intervals.
After the blower air is stabilized, read the dry-bulb thermometer.
Verify the ambient temperature.

Fig 1: Performing Refrigerant System Test
Courtesy of MAZDA MOTORS CORP.
Verify that the temperature reading is in the shaded zone.
- If the there is any malfunction, inspect the refrigerant system according to the troubleshooting chart.
  
  Fig 2: Refrigerant System Characteristic Curve
  Courtesy of MAZDA MOTORS CORP.