Mazda CX-9 Grand Touring 2009 Manual page 1740

2. Place a dry-bulb thermometer in the driver-side center ventilator outlet.
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.
If the there is any malfunction, inspect the refrigerant system according to the troubleshooting
chart.
Fig. 13: Ambient Temperature Graph
Courtesy of MAZDA MOTORS CORP.
2008 Mazda CX-9 Grand Touring
2008 HVAC Refrigerant System - Mazda CX-9