Troubleshooting and Repair air
Conditioning
HVAC-02
Part 2
A/C System Troubleshooting:
The
following is an general A/C system troubleshooting guide. Realize that
it is generic and many of the things listed here may not apply to the
944.
Symptom / Possible Cause:
Low Suction Pressure
1. Refrigerant shortage
2. Worn compressor piston
3. Compressor head gasket leaking
4. Kinked or flattened hose
5. Compressor suction valve leaking
6. Moisture in system
7. Trash in expansion valve or screen
Solutions:
Repair
1. Add refrigerant
2. Replace compressor
3. Replace head gasket
4. Replace hose
5. Change valve plate
6. Replace drier
7. Replace drier
High Suction Pressure
1. Loose expansion valve
1. Loose expansion valve
2. Overcharged system
3. Expansion valve stuck open
4. Compressor reed valves
5. Leaking head gasket on compressor
Solutions:
Repair
1. Tighten valve
2. Remove some refrigerant
3. Replace expansion valve
4. Replace reed valves
5. Replace head gasket
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