Compressor HVAC: Testing and Inspection

1. Install manifold gauge set.




2. Check compressor drive belt tension.
3. Run engine at approx. 1,500 rpm.
4. Check compressor for following:
1. Low pressure gauge reading is not lower and high pressure gauge reading is not higher than abnormal.
2. Metallic sound.
3. Leakage from shaft seal.
If there is any case among the above, repair the compressor.

5. Check magnetic clutch.
1. Lift-up the vehicle.
2. Inspect the pressure plate and the rotor for signs of oil.
3. Check the clutch bearings for noise and leaking grease.
4. Using an ohmmeter, measure the resistance of the stator coil between the clutch lead wire and ground.

Standard resistance : 3.23 ± 0.08 Ohms at 12.8 Volts 20 °C (68 °F)

If resistance value is not as specified, replace the coil.

5. Connect the positive (+) lead from the battery to terminal, check that the magnetic clutch is energized. If magnetic clutch is not energized, replace the coil.

CAUTION: Do not short the positive (+) lead wire on the vehicle by applying battery voltage.


The oil used to lubricate the compressor circulates in the system while the compressor is operating. Whenever replacing any component of the system or when a large amount of gas leakage occurs, add oil to maintain the original total amount of oil.

Total amount of oil in the system: 154cc (5.13 us fl.oz)