GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2004 🢒 Colorado Pickup - 2WD 🢒 HVAC 🢒 Heating, Ventilation and Air Conditioning 🢒 Air Conditioning Compressor Oil Balancing

Draining Procedure

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

  1. Drain the oil from both the suction and discharge ports of the removed compressor into a clean, graduated container.

    2. Rotate the compressor shaft to assist in draining the compressor.


    Object Number: 821777 Size: SH
  2. Measure and record the amount of oil drained from the removed compressor.

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

  3. Properly discard the used refrigerant oil.

Balancing Procedure

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

  1. The replacement compressor is shipped with 119 ml (4.0 oz) of refrigerant oil.

    2. Object Number: 821777 Size: SH
  2. Before installing the compressor, the refrigerant oil will have to be fully drained:
    3. 2.1. Refer to the amount of refrigerant oil recorded during the compressor removal.
    2.2. Subtract the amount recorded from the total system capacity. Refer to Refrigerant System Capacities .

    The difference between the total system capacity and the recorded amount is the calculated amount to be drained from the replacement compressor.

  3. Add back the same quantity of polyalkylene glycol (PAG) oil as drained from the removed compressor.