Pressure Check

It is recommended that a free standing air mover is placed in front of the condenser / cooling system.

Pressure Check

1. Connect the Recovery / Recycling / Recharging unit.
2. Start the engine. Allow to warm up then run at a constant 1,500 rpm.
3. Set the following A/C controls:
• Air Circulation to ‘Recirculate’
• Temperature to ‘Max’ Cold
• Air Flow to ‘Vent’
4. Close all the vehicle doors and windows.
5. Measure the ambient temperature and high / low pressure side reading of Recovery / Recycling / Recharging unit gauges.
6. Verify that the intersection of the pressure reading of the Recovery / Recycling / Recharging unit gauges and the ambient temperature is in the shaded zone.

Figure 3: Manifold Gauge Pressure vs Ambient Temperature

If there is any fault, inspect the refrigerant system according to the troubleshooting chart.

Performance Test

1. Check the refrigerant pressure.
2. Place a dry-bulb thermometer in the driver-side center ventilator outlet.
3. Start the engine. Allow to warm up then run at a constant 1,500 rpm.
4. Set the A/C unit fan speed to ‘Max Hi’.
5. Turn the A/C system on.
6. Set the following A/C controls:
• Air Circulation to ‘Recirculate’
• Temperature to ‘Max’ Cold
• Air Flow to ‘Vent’
7. Close all the doors and windows.
8. Wait until the A/C output temperature stabilizes.
9. After the blower air is stabilized, read the dry-bulb thermometer.
10. Verify the ambient temperature.
11. Verify the temperature is in the shaded zone.

Figure 2: Center Ventilator Temperature vs Ambient Temperature

Stabilized condition.
The A/C compressor repeatedly turns on and off at regular intervals.

If there is any fault, inspect the refrigerant system according to the troubleshooting chart.

Vacuum Check

1. Stop the vacuum pump, note the high and low pressure side readings of the Recovery / Recycling / Recharging unit gauges and wait for 5 min.
2. Check the high and low pressure side readings of the Recovery / Recycling / Recharging unit gauges.

1. If the readings have changed, inspect for leaks and go to Evacuation (Refer to ’Evacuation’, page 12-3-8).
2. If the readings have not changed, go to Charging (Refer to ’Charging’, page 12-3-8).