Refrigerant System Performance Test

WARNING: This page is about a different car, the 2017 Mazda 3. 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.

Fig 1: Placing A Dry-Bulb Thermometer
Courtesy of MAZDA MOTORS CORP.
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.
Verify that the temperature reading is in the shaded zone.

Fig 2: Checking Ambient Temperature

Courtesy of MAZDA MOTORS CORP.

If the there is any malfunction, inspect the refrigerant system according to the troubleshooting chart.
(See FOREWORD [FULL-AUTO AIR CONDITIONER] .) (See FOREWORD [MANUAL AIR CONDITIONER] .)