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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Heating, Ventilation, And Air Conditioning >> Repair Instructions >> Compressor Oil Balancing >> Draining Procedure

Draining Procedure

    IMPORTANT: Drain and measure as much of the refrigerant oil as possible from the removed compressor.
  1. Before draining oil, position the compressor verdically (clutch facing upwards) and let it sit for 1 minute.
  2. Position the compressor horizontally, with the ports facind downward, rotate the clutch and shake the compressor in order to remove as much oil from the compressor as possible.
  3. Drain the oil from both the suction and discharge ports of the removed compressor into a clean, graduated container. Rotate the compressor shaft to assist in draining the compressor.
    4. Fig 1: Draining A/C Refrigerant Oil From Compressor
    GM821777Courtesy of GENERAL MOTORS CORP.
  4. Measure and record the amount of oil drained from the removed compressor. This measurement will be used during installation of the replacement compressor.
  5. Properly discard the used refrigerant oil.
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