External Leak Test

1. If the A/C compressor is on the vehicle, discharge the system. Remove the A/C compressor from the vehicle. Observe all safety precautions.

2. Remove the manifold retaining bolt and remove the manifold from the rear head of the A/C compressor. Install pressure test adapter on the rear head of the A/C compressor using the existing manifold attaching bolt.

3. Connect the high and low pressure lines of Rotunda R-134a Manifold Gauge Set 176-R032A or equivalent to the corresponding fittings on the pressure test adapter.

4. Attach the center hose of the manifold gauge set to a refrigerant container standing in an upright position.

5. Using the clutch hub, hand-rotate the A/C compressor shaft ten revolutions to distribute the oil inside the A/C compressor.

6. Open the low pressure gauge valve, the high pressure gauge valve and the valve on the refrigerant container to allow the refrigerant vapor to flow into the A/C compressor.

7. Using Rotunda R-134a Automatic Calibration Halogen Leak Detector 161-ROOlO or equivalent check for leaks at the compressor shaft seal and the compressor center seal.

8. If a shaft seal leak is found, install a new shaft seal. If an external leak is found at the center joint of the A/C compressor, install a new A/C compressor assembly.

9. When the leak test is completed, close the manifold gauge valves (both high and low) as well as the valve on the refrigerant container.

10. Slowly remove the gauge set hoses from the pressure test fitting tool. (Allow the refrigerant to escape from the compressor).

11. Install the A/C compressor on the vehicle.

12. Leak test, evacuate and charge the system. Observe all safely precautions.