Troubleshooting and Repair air Conditioning HVAC-02 Part 3

Troubleshooting and Repair air
Part 3


Symptom / Possible Cause:
Compressor Not Working
1. Broken belt 
2. Broken clutch wire or no 12v power 
3. Broken compressor piston 
4. Bad thermostat 
5. Bad clutch coil 
6. Low Refrigerant - low pressure switch has cut off clutch power

1. Replace belt 
2. Repair wire or check for power 
3. Replace compressor 
4. Replace thermostat 
5. Replace clutch coil 
6. Add refrigerant

Evaporator Not Cooling
 1. Frozen coil, switch set too high 
 2. Drive belt slipping 
 3. Hot air leaks into car 
 4. Plugged receiver drier 
 5. Capillary tube broken 
 6. Shortage of refrigerant 
 7. High head pressure
 8. Low suction pressure 
 9. High suction pressure
 10. Defective expansion valve 
11. Frozen expansion valve
 1. Turn thermostat switch back 
 2. Tighten belt 
 3. Check for holes or open vents
 4. Replace drier 
 5. Replace expansion valve 
 6. Add refrigerant 
 7. See problem #2
 8. See problem #3 
 9. See problem #4 
10. Replace expansion valve 
11. Evacuate and replace drier

Frozen Evaporator Coil
 1. Faulty thermostat
 2. Thermostat not set properly 
 3. Insufficient evaporator air

 1. Replace thermostat 
 2. Set to driving condition
 3. Check for excessive duct hose length, kink or bend.

AC System Gauge Readings
The following table is a general guideline for A/C system pressures and temperatures based on ambient outside temperature. Remember that these are a guideline and your actual temperatures and pressures will vary depending on humidity in the air and the condition of your system.

                                      abo bahaaeddine


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