Draining Procedure

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Remove the A/C compressor from the vehicle. Refer to Air Conditioning Compressor Replacement (HP2) , Air Conditioning Compressor Replacement (LY2, LY5, LH6, L76, L92, LC9 and LMG) .

Fig 1: A/C Hose Routing

Courtesy of GENERAL MOTORS CORP.

NOTE:

Drain and measure as much of the refrigerant oil as possible from the removed compressor.

Drain the oil from both the suction and discharge ports of the removed compressor into a clean, graduated container.
Measure and record the amount of oil drained from the removed compressor. This measurement will be used during installation of the replacement compressor.

NOTE:

During the oil removal procedure, the condition of the oil should be evaluated. Compressor oil never breaks down unless something is wrong with the compressor or air conditioning (A/C) system. If one or more of the following conditions exist, replace the compressor and receiver dehydrator.

Inspect oil drained from the removed compressor. Refer to Air Conditioning Compressor Oil Diagnosis .
Properly discard the used POE refrigerant oil.