Compressor HVAC: Testing and Inspection

A/C COMPRESSOR INSPECTION

External Leak Test

1. Install the A/C pressure test adapter 412-093 (T94P-19623-E) or equivalent on the rear head of the A/C compressor using the existing manifold retaining bolt.
2. Connect the high and low pressure lines of a manifold gauge set or a refrigerant recovery/recycling station to the corresponding fittings on the A/C pressure test adapter.
3. Attach the center hose of the manifold gauge set to a refrigerant container standing in an upright position.
4. Hand-rotate the compressor shaft 10 complete revolutions to distribute the oil inside the A/C compressor.
5. 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.
6. Using a R-134a leak detector, check for leaks at the compressor shaft seal and the compressor center seal.
7. If a shaft seal leak is found, install a new shaft seal. See A/C COMPRESSOR SHAFT SEAL REMOVAL / INSTALLATION. If an external leak is found at the center joint of the A/C compressor, install a new A/C compressor.
8. When the leak test is complete, recover the refrigerant, see A/C REFRIGERANT SYSTEM TESTS.