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Flush Procedure

WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE:

    Warmer engine or ambient temperatures decreases refrigerant recovery time during the A/C flush procedure.

  1. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging .
  2. Remove the thermal expansion valve (TXV). Refer to Air Conditioning Evaporator Thermal Expansion Valve Replacement .
  3. Install the TXV stud onto GE-45268-115  adapter.
  4. Install new sealing washers onto evaporator core. Refer to Air Conditioning O-Ring Seal Replacement .
  5. Install GE-45268-115  adapter in place of the TXV.
    6. CAUTION:

    Refer to Fastener Caution .

  6. Install the TXV mounting bolts. For tightening specifications refer to special tool manual.

    Install new washers onto liquid line and suction hose. Refer to Air Conditioning O-Ring Seal Replacement .

  7. Connect liquid line and suction hose to GE-45268-115  adapter.
  8. Install the TXV block fitting nut. For tightening specifications refer to special tool manual.
  9. Remove the A/C compressor. Refer to Air Conditioning Compressor Replacement .
  10. GM2027401

    Remove the A/C refrigerant filter (1). Refer to Air Conditioning (AC) Refrigerant Filter Replacement .

    11. NOTE:

    The filter inside GE-45628-1  adapter is serviceable. Remove and discard check valve from the filter.

  11. Service the filter before each flush.
    12. NOTE:

    Assure that suction and discharge ports on GE-45268-10 correspond to suction and discharge ports on compressor hose assembly.

  12. Install new sealing washers onto A/C compressor and condenser hose. Refer to Air Conditioning O-Ring Seal Replacement . Assure that suction and discharge ports on GE-45268-10  adapter correspond to suction and discharge ports on A/C compressor to condenser hose.
  13. Install GE-45268-10  filter adapter to the A/C compressor to condenser hose.
  14. Connect GE-45268-1  filter to GE-45268-7  adapter.
  15. Connect blue hose from A/C filling device to GE-45268  adapter.
  16. Connect red hose from A/C filling device to GE-45268  adapter.
  17. Disconnect blue hose from A/C filling device to GE-45268-1  adapter.
  18. Disconnect GE-45628-1  adapter from GE-45268-10  adapter.
  19. Remove GE-45268-10  adapter from the A/C compressor to condenser hose.
    20. NOTE:

    Flushing will remove all PAG oil from the A/C system. The A/C system must be replenished with the correct amount of PAG oil.

  20. If you will reinstall the removed A/C compressor, perform the following procedure:
    • Drain PAG oil from the A/C compressor. Rotate compressor input shaft to assist in draining the PAG oil from compressor
    • Add the total system capacity of PAG oil to A/C compressor. Refer to Approximate Fluid Capacities .
    • Add one bottle of GE-41447  tracer dye
    21. NOTE:

    Flushing will remove fluorescent leak detection dye from A/C system.

  21. Install the A/C compressor. Refer to Air Conditioning Compressor Replacement .
  22. Install new A/C refrigerant filter. Refer to Air Conditioning (AC) Refrigerant Filter Replacement .
  23. Remove the TXV block fitting nut.
  24. Disconnect liquid line and suction line from GE-45628-115  adapter.
  25. Remove the TXV bolts retaining GE-45628-115  adapter.
  26. Remove GE-45628-115  adapter.
  27. Inspect the TXV for debris. Clean or replace as needed.
  28. Install the TXV. Refer to Air Conditioning Evaporator Thermal Expansion Valve Replacement .
  29. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging .
  30. Leak test fittings using BO-42220  lamp.
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