Component Tests and General Diagnostics
REFRIGERANT SYSTEM PERFORMANCE TEST1. Perform refrigerant pressure check.
- If they are correct, go to the next step.
- If not as specified, troubleshoot refrigerant system.
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.
REFRIGERANT PRESSURE CHECK
1. Install the manifold gauge set.
2. Close the hood.
3. Warm up the engine and run it at a constant 1,500 rpm.
4. Set the fan switch to 4th position.
5. Turn the A/C switch on.
6. Set the RECIRCULATE mode.
7. Set the temperature control to MAX COLD.
8. Set the VENT mode.
9. Close all the doors and all the windows.
10. Measure the ambient temperature and the high-and low-pressure side readings of the manifold gauge.
- If the high- and low-pressure side readings are in the shaded zone as shown in the figure, the refrigerant system is normal.
- If the pressure is abnormal, see No.6 of symptom troubleshooting.