A/C Cooling Performance Check

NOTE:
Temperature in the evaporator is regulated by the A/C thermostat E33; the A/C refrigerant low pressure switch F73 does not cycle in normal operation.

INSPECTION

1. Ensure all system fuses are satisfactory.
2. Ambient temperature is greater than 15°C (59°F).
3. Condenser and radiator are clean and free of obstructions.
4. V-belts for compressor and alternator are correctly tightened.
5. All air ducts, covers and seals are OK and correctly installed.
6. Vehicle is not exposed to direct sunlight.
7. Engine is at operating temperature.
8. With engine running and ECON mode selected, fresh air/recirculation flap must operate via the recirculation button.

With engine running:
1. Set mode to AUTO and temperature to LO.
2. Set blower speed to HI.

Open instrument panel outlets:
1. Ensure compressor is driven or switches ON.
2. Fresh air blower runs.
3. Radiator cooling fan runs.
4. Check recirculation/fresh air flap goes into recirculation position after one minute.
5. Heater valve is closed.
6. Evaporator, heater and connecting piece between heater and evaporator does not draw any secondary air (no air leaks).
7. Air comes out of instrument panel outlets and temperature flap is in cooling position.

TESTING

Fig. 1 A/C Cooling Performance Chart:

Temperature of air coming out of center instrument panel outlets must be within tolerance on chart, and depends on ambient air temperature and cool down period.

A/C Cooling Performance Check, Chart 1 Of 2:

Chart 1 of 2

A/C Cooling Performance Check, Chart 2 Of 2:

Chart 2 of 2