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Flush Procedure

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

    Warmer engine or ambient temperatures decreases the refrigerant recovery time during the air conditioning flush procedure.

  1. Recover the refrigerant. Refrigerant Recovery and Recharging 
  2. Remove the Air Conditioning Evaporator Thermal Expansion Valve. Air Conditioning Evaporator Thermal Expansion Valve Replacement 
  3. GM1348197Courtesy of GENERAL MOTORS COMPANY

    Install the stud onto the J 45268-121.

  4. Install new sealing washers onto the evaporator core. Air Conditioning System Seal Replacement 
  5. Install J 45268-121 in place of the Air Conditioning Evaporator Thermal Expansion Valve.
    6. CAUTION:

    Refer to Fastener Caution

  6. Install the Air Conditioning Evaporator Thermal Expansion Valve Bolt and tighten to 9 N.m (80 lb in).
  7. Install new sealing washers onto the rear evaporator line assembly. Air Conditioning System Seal Replacement 
  8. Connect the rear evaporator line assembly to the J 45268-121.
  9. Install the Air Conditioning Evaporator Thermal Expansion Valveblock fitting nut and tighten to 20 N.m (15 lb ft).
  10. Remove the air conditioning compressor. Air Conditioning Compressor Replacement (LCV, LTG) 
  11. GM787687Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    The filter inside J 45268-1 is serviceable. Remove and discard the check valve from the filter.

    Service the filter with ACDelco P/N GF 470, before each flush.

    12. NOTE:

    Install new sealing washers onto the compressor hose assembly. Air Conditioning System Seal Replacement 

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

  12. Install the J 45268-10 to the compressor hose assembly.
  13. Connect the J 45268-1 flush filter to the J 45268-7 flush adapter.
  14. GM1348182Courtesy of GENERAL MOTORS COMPANY

    Connect the blue hose from the J 43600  ACR 2000 Air Conditioning Service Center to J 45268-1 flush filter adapter.

  15. Connect the red hose from the J 43600  ACR 2000 Air Conditioning Service Center to J 45268-8 flush adapter.
    16. NOTE:

    Close the valve on the external refrigerant tank, before starting the flush process.

  16. Flush the air conditioning system. Follow the instructions supplied with the J 43600  ACR 2000 Air Conditioning Service Center.
  17. Disconnect the red hose from the J 43600  ACR 2000 Air Conditioning Service Center to J 45268-8 flush adapter.
  18. Disconnect the blue hose from the J 43600  ACR 2000 Air Conditioning Service Center to J 45268-1 flush filter adapter.
  19. Disconnect the J 45268-1 flush filter from the J 45268-10 flush adapter.
  20. Remove the J 45268-10 from the compressor hose assembly.
    21. NOTE:

    Flushing will remove all the refrigerant oil from the air conditioning system.

    The air conditioning system must be replenished with the correct amount of refrigerant oil.

  21. If you will reinstall the removed air conditioning compressor, perform the following procedure:
    1. Drain the refrigerant oil from the air conditioning compressor. Rotate the compressor input shaft to assist in draining the refrigerant oil from the compressor.
    2. Add the total system capacity of refrigerant oil to the crankcase of the air conditioning compressor. Approximate Fluid Capacities 
      3. NOTE:

      Flushing will remove the fluorescent leak detection dye from the air conditioning system.

    3. Add one bottle of J 41447  R-134A Air Conditioning Tracer Dye - Box of 24 directly to the air conditioning compressor.
    22. NOTE:

    A new service compressor is shipped with 2.5 oz of refrigerant oil. Approximate Fluid Capacities 

  22. Install the air conditioning compressor. Air Conditioning Compressor Replacement (LCV, LTG) 
  23. Remove the Air Conditioning Evaporator Thermal Expansion Valveblock fitting nut.
  24. Disconnect the rear evaporator line assembly from the J 45268-121.
  25. GM1348197Courtesy of GENERAL MOTORS COMPANY

    Remove the Air Conditioning Evaporator Thermal Expansion Valve bolts retaining the J 45268-121.

  26. Remove the J 45268-121.
  27. Inspect the Air Conditioning Evaporator Thermal Expansion Valve for debris. Clean or replace as needed.
  28. Install the Air Conditioning Evaporator Thermal Expansion Valve. Air Conditioning Evaporator Thermal Expansion Valve Replacement 
  29. Evacuate and recharge the air conditioning system. Refrigerant Recovery and Recharging 
  30. Leak test the fittings using J 42220  Universal 12V Leak Detection Lamp.
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