Troubleshooting and Repair air Conditioning HVAC-02 Part 2

Troubleshooting and Repair air

Conditioning

HVAC-02

Part 2

 

HVAC-02 REPAIR

 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

 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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