Range Rover P38
AIR CONDITIONING
5
FAULT DIAGNOSIS
Symptom - High Head Pressure
POSSIBLE CAUSE
REMEDY
1. Overcharge of refrigerant.
1. Discharge, evacuate and recharge system.
2. Air in system.
2. Discharge system, fit new receiver/drier, evacuate and recharge
system.
3. Condenser air passage
blocked with dirt etc.
3. Clean condenser of debris.
4. Condenser fan motor/s
defective.
4. Renew motor/s.
5. Loose compressor drive belt.
5. Check drive belt tensioner or renew drive belt.
6. Seized compressor.
6. Renew compressor.
Symptom - Low Head Pressure
POSSIBLE CAUSE
REMEDY
1. Undercharge of refrigerant.
1. Evacuate and recharge system.
2. Leaking compressor valves.
2. Renew compressor.
3. Defective compressor.
3. Renew compressor.
Symptoms - High Suction Pressure
POSSIBLE CAUSE
REMEDY
1. Loose drive belt.
1. Check drive belt tensioner or renew drive belt.
2. Refrigerant flooding through
evaporator into suction line;
evident by ice on suction line.
2. Renew expansion valve.
3. Expansion valve stuck open.
3. Renew expansion valve.
4. Leaking compressor valves.
4. Renew compressor.
5. Receiver/drier blocked; evident
by temperature difference
between input and output lines.
5. Fit new receiver/drier, evacuate and recharge system.
