GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2004 🢒 Monte Carlo 🢒 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.


    Object Number: 1342638 Size: SH
  1. Remove the compressor crankcase oil drain plug and drain the crankcase into a clean, graduated container.
  2. Drain the oil from both the suction and discharge ports of the removed compressor into the same container.

    3. 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. 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 174 ml (5 oz) of refrigerant oil.

    2. Object Number: 821777 Size: SH
  2. Before installing the replacement compressor, the refrigerant oil will have to be adjusted.

    3. Refer to the amount of refrigerant oil recorded during the compressor removal. If the amount of refrigerant oil drained and recorded from the removed compressor is:

    • Less than 174 ml (5.0 oz) of pag oil was drained from the removed compressor subtract the amount recorded from the replacement compressor capacity. Refer to Refrigerant System Capacities .
    • The difference between the replacement compressor capacity and the recorded amount is the calculated amount to be drained from the replacement compressor.
    • More than 174 ml (5.0 oz) of pag oil was drained from the removed compressor add the amount over 174  (5.0 oz) to the replacement compressor.