A/C System Performance Test
WARNING: R134a is hazardous. Service PrecautionsCarry out this test with bonnet and doors or windows open, air conditioning switched on, temperature control set to cold and blower at maximum speed. Set the air supply control to supply fresh air.
1. Close low pressure valve on refrigerant station.
2. Close high pressure valve on refrigerant station.
3. Connect a Refrigerant Station to the high and low pressure servicing connections.
4. Insert dry bulb thermometer into cold air outlet and position dry and wet bulb thermometer close to outside air inlet.
Do not spill water from the wet thermometer (psychrometer).
5. Start engine and run it at 1500 rev/min for 10 minutes with air conditioning switched on.
6. Check that sight glass is free of bubbles.
7. Read both pressure gauges and thermometers. Check readings against table below with humidity between 60% and 80%. If readings are incorrect A/C System Fault Tracing Charts
8. Switch off air conditioning, stop engine, disconnect test equipment.
Performance Range Chart:
Table 1:
