GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2009 🢒 Corvette 🢒 HVAC 🢒 Heating, Ventilation, and Air Conditioning 🢒 Air Conditioning Compressor Oil Balancing

Draining Procedure

    Note: Drain and measure as much of the refrigerant oil as possible from the rear head ports and the front head compressor drain bolt hole of the REMOVED compressor.

  1. Remove the compressor crankcase oil drain bolt and drain the refrigerant oil from the crankcase and rear head ports into a clean, graduated container.

    2. Object Number: 1480009 Size: SH
  2. Rotate the compressor shaft to assist in draining the compressor.
  3. Measure and record the amount of oil drained from the removed compressor.

    4. This measurement will be used during installation of the replacement compressor.

  4. Inspect oil drained from removed compressor. Refer to Air Conditioning Compressor Oil Diagnosis.
  5. Properly discard the used refrigerant oil.
  6. Clean the graduated cylinder.

    7. Note: Drain and measure as much of the refrigerant oil as possible from the rear head ports and the front head compressor drain bolt hole of the NEW compressor.

  7. Remove the compressor crankcase oil drain bolt and drain the refrigerant oil from the crankcase and rear head ports into a clean, graduated container.
  8. Rotate the compressor shaft to assist in draining the compressor.

Balancing Procedure

    Object Number: 1480036 Size: SH

    Note: The refrigerant oil in the A/C system must be balanced during compressor replacement.

    The replacement compressor is shipped with the total system capacity of refrigerant oil.

  1. Refer to the amount of refrigerant oil recorded during the compressor removal.
  2. If the amount of oil recorded from the removed compressor is less than or equal to 75 ml (2.5 fl. oz), add 75 ml of the new PAG oil back into the new compressor through the compressor oil drain bolt hole.

    3. Caution: Refer to Fastener Caution in the Preface section.


    Object Number: 1480098 Size: SH
  3. Install the compressor oil drain bolt and tighten to 15 N·m (11 lb ft).
  4. Rotate the clutch driver three times to lubricate the internal compressor components.

    5. Note: If additional A/C components are replaced during compressor replacement, add the PAG oil directly to the A/C compressor to compensate the A/C system.

  5. If necessary, refer to Refrigerant System Capacities.