If a very small leak is suspected, wait 30 minutes and observe the vacuum gauge.
If a small amount of vacuum is lost, operate the vacuum pump with gauge valves open for an additional 30 minutes to remove any remaining refrigerant from the oil in the A/C
evaporator core or A/C condenser core. Then recheck for loss of vacuum.
If a very small leak is suspected, allow the system to set overnight with vacuum applied and check for vacuum loss.
8. If the A/C evaporator core or A/C condenser core does leak, as verified by the above procedure, install a new A/C evaporator core or A/C condenser core. For additional information,
refer to
Section 412-01
.
A/C Compressor — External Leak Test
1. Install the appropriate fittings from the A/C Flush Adapter Kit on the rear head of the A/C compressor using the existing retaining bolts.
2. Connect the high and low pressure lines of a manifold gauge set or a refrigerant recovery/recycling station, such as the R-134a A/C Service Center, 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 the Electronic Refrigerant Leak Detector, check for leaks at the compressor shaft seal and the compressor center seal.
7. If a shaft seal leak or an external leak is found at the A/C compressor, install a new A/C compressor.
8. When the leak test is complete, recover the refrigerant from the compressor.
Page 45 of 45
2006 Town Car Workshop Manual
12/30/2011
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