Check For Leaks

A/C COMPRESSOR - EXTERNAL LEAK TEST
WARNING:
^ R134A IS CLASSIFIED AS A SAFE REFRIGERANT, BUT MISUSE CAN MAKE IT DANGEROUS. THE FOLLOWING PRECAUTIONS MUST BE OBSERVED.
^ ALWAYS WEAR SAFETY GOGGLES WHEN SERVICING AN AIR CONDITIONING SYSTEM.
^ AVOID CONTACT WITH LIQUID REFRIGERANT R134A. R134A VAPORIZES AT APPROXIMATELY -20°F UNDER ATMOSPHERIC PRESSURE AND IT WILL FREEZE SKIN TISSUE.
^ NEVER ALLOW REFRIGERANT R134A GAS TO ESCAPE IN QUANTITY IN AN OCCUPIED SPACE. R134A IS NON-TOXIC, BUT IT IS A HEAVIER THAN AIR GAS THAT WILL DISPLACE OXYGEN. THIS CAN CAUSE SUFFOCATION.
^ NEVER USE A TORCH IN AN ATMOSPHERE CONTAINING R134A GAS. R134A IS NON-TOXIC AT ALL NORMAL CONDITIONS, BUT WHEN IT IS EXPOSED TO HIGH TEMPERATURES, SUCH AS A TORCH FLAME, IT DECOMPOSES. ONE OF THE PRODUCTS OF THE CHEMICAL BREAKDOWN IS A PHOSGENE GAS WHICH IS HIGHLY TOXIC.
^ CARE MUST BE EXERCISED SO AS NOT TO HEAT ANY PORTION OF THE CHARGED AIR CONDITIONING SYSTEM TOO HOT. THE PRESSURE IN AN AIR CONDITIONING SYSTEM RISES AS THE TEMPERATURE RISES AND TEMPERATURES OF APPROXIMATELY 200°F CAN BE DANGEROUS.

1. Discharge the A/C system.
2. Remove the A/C compressor.
3. Install the A/C pressure test adapter on the rear head of the A/C compressor using the existing bolt.
4. Connect the high and low pressure lines of the manifold gauge set to the corresponding fittings on the A/C pressure test adapter.
5. Attach the center hose of the gauge set to a refrigerant container standing in an upright position.
6. Using the clutch hub, hand-rotate the compressor shaft 10 revolutions to distribute the oil inside the A/C compressor.
7. 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.
8. Using the Automatic Calibration Halogen Leak Detector, check for leaks at the compressor shaft seal and the compressor center seal.
9. If a compressor shaft seal leak is found, refer to Air Conditioning.
10. If a compressor center seal leak is found, refer to Air Conditioning.
11. Close the gauge valves and the refrigerant container valve.
12. Slowly remove the gauge set hoses from the pressure test fitting tool.
13. Install the compressor.
14. Recharge the A/C system.