Compressor HVAC: Testing and Inspection
1. INSPECT COMPRESSOR FOR METALLIC SOUNDa. Start engine.
b. Check there is abnormal metallic sound from the compressor when the A/C switch is ON.
If abnormal sound is heard, replace the compressor assembly.
2. INSPECT REFRIGERANT PRESSURE
3. INSPECT COMPRESSOR LOCK SENSOR RESISTANCE
4. INSPECT VISUAL FOR LEAKAGE OF REFRIGERANT FROM SAFETY SEAL
Using a gas leak detector, check for leakage of refrigerant.
If there is any leakage, replace the compressor assembly.
5. CHECK FOR LEAKAGE OF GREASE FROM CLUTCH BEARING
6. CHECK FOR SIGNS OF OIL ON PRESSURE PLATE
If necessary repair or replace.
7. INSPECT MAGNETIC CLUTCH BEARING FOR NOISE
a. Start engine.
b. Check for abnormal noise near the compressor when the A/C switch is OFF.
If abnormal noise is being emitted, replace the magnetic clutch.
8. INSPECT MAGNETIC CLUTCH OPERATION
a. Disconnect the connector.
b. Connect the positive (+) lead from the battery to terminal 3 and the negative (-) lead to the body ground.
c. Check that the magnetic clutch is energized.
If operation is not as specified, replace the magnetic clutch.