Air Conditioning - System Diagnosis
This section gives an overview of the following conditions:
Normally Functioning A/C System
Low R-134a Charge
Poor Refrigerant Circulation
No Refrigerant Circulation
Insufficient Cooling of Condenser
Air in System
Expansion Valve Improperly Mounted
Compressor Malfunction
Moisture in the System
Component Key:
A High Pressure/Temperature Gas.
B Low Pressure/Temperature Gas.
C High Pressure Liquid.
LOW SIDE - 2.0 bar (2.0 kgf/cm
2
)(29 lbf/in
2
)
HIGH SIDE - 14.8 bar (15.1 kgf/cm
2
)(215 lbf/in
2
)
Normally Functioning A/C System
Gauge Readings:
Low Side Gauge - Normal.
High Side Gauge - Normal.
Other Indications:
Sight Glass - Clear.
Discharge Air - Cold.
Note: Normal gauge readings will depend on system
components and ambient conditions, make sure that the
valves are closed and the readings are stable and that the
system has a full charge.
The pressures on the manifold at 25 °C with the engine at
1500 RPM, the blower on maximum and the thermostat set
to maximum, should be approximately:
Typically, the high pressure is 6 - 8 times the low pressure.
LOW SIDE (Blue) HIGH SIDE (Red)
Normal Normal
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