Component Tests and General Diagnostics

REFRIGERANT SYSTEM PERFORMANCE TEST

1. Perform refrigerant pressure check.
- If it is correct, go to step 2.
- If not as specified, troubleshoot the refrigerant system.

2. Install the manifold gauge set.
3. Open the hood.
4. Close all the doors and all the windows.
5. Warm up the engine and run it at a constant 1,500 rpm.
6. Turn the AUTO switch on.
7. Set the temperature setting dial to 18.0 °C {65 °F}.
8. 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 the A/C amplifier.
9. Record center ventilator left side temperature.
10. Determine and record ambient temperature.




11. 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. Open the hood.
3. Close all the doors and all the windows.
4. Warm up the engine and run it at a constant 1,500 rpm.
5. Turn the AUTO switch on.
6. Set the temperature setting dial to 18.0 °C {64 °F}.




7. 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 shown in the figure, the refrigerant system is normal.
- If the pressure is abnormal (see No.17 of symptom troubleshooting. (See No.17 AIR FROM VENTS NOT COLD ENOUGH.)