Compressor HVAC: Testing and Inspection

ON-VEHICLE INSPECTION

1. Make the following visual checks.

- Leakage of grease from the clutch bearing.

- Signs of oil on the pressure plate or rotor. Repair or replace, as necessary.

2. Inspect magnetic clutch bearing for noise.
a. Start engine.
b. Check for abnormal noise from near the compressor when the A/C switch is OFF.

If abnormal noise is being emitted, replace the magnetic clutch.





3. Inspect magnetic clutch.
a. Disconnect the connector from the magnetic clutch.
b. Connect the positive (+) lead from the battery to the terminal on the magnetic clutch connector 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.

INSPECTION

1. Install manifold gauge set.
2. Start engine.
3. Inspect compressor for metallic sound. Check if there is a metallic sound from the compressor when the A/C switch is turn on.
If metallic sound is heard, replace the compressor assembly.
4. Inspect pressure of refrigeration system.
5. Stop engine.
6. Inspect visually for leakage of refrigerant from safety seal.
If there is any leakage, replace the compressor assembly.