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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 183 (Heating, Ventilation, And Air Conditioning) >> Repair Instructions >> Flushing (R-134a) >> Flush Procedure

Flush Procedure

WARNING: This page is about a different car, the 2017 Cadillac ATS. 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 A/C flush procedure.

  1. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging (R-134a) 
  2. Remove the thermal expansion valve (TXV). Refer to Air Conditioning Evaporator Thermal Expansion Valve Replacement (LCV) Air Conditioning Evaporator Thermal Expansion Valve Replacement (LTG) Air Conditioning Evaporator Thermal Expansion Valve Replacement (LF4, LGX) 
  3. Install the TXV stud onto the GE-45268-115 adapter.
  4. Install new sealing washers onto the evaporator core. Refer to Air Conditioning System Seal Replacement 
  5. Install GE-45268-115 in place of the TXV.
    6. CAUTION:

    Refer to Fastener Caution .

  6. Install TXV mounting bolts and tighten to 5 N.m (44 lb in).
  7. Install new washers onto the liquid line and suction hose. Refer to Air Conditioning System Seal Replacement 
  8. Connect the liquid line and suction hose to the GE-45268-115.
  9. Install the TXV block fitting nut and tighten to 22 N.m (16 lb ft).
  10. Remove the A/C compressor. Refer to Air Conditioning Compressor Replacement (LCV) Air Conditioning Compressor Replacement (LTG) Air Conditioning Compressor Replacement (LF4) Air Conditioning Compressor Replacement (LGX) 
    11. Fig 1: A/C Filter And Check Valve
    GM787687Courtesy of GENERAL MOTORS COMPANY
    NOTE:

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

  11. Service the filter before each flush.
  12. Install new sealing washers onto the compressor hose assembly. Refer to Air Conditioning System Seal Replacement 
    13. NOTE:

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

  13. Install the GE-45268-10 to the A/C compressor to condenser hose assembly.
  14. Connect the GE-45268-1 filter to GE-45268-7 adapter.
    15. Fig 2: Flush Adapters
    GM1348182Courtesy of GENERAL MOTORS COMPANY
  15. Connect the blue hose from the GE-48800  CoolTech A/C Recharge Machine to GE-45268-1 flush filter adapter.
  16. Connect the red hose from the GE-48800  CoolTech A/C Recharge Machine to fitting GE-45268-8.
    17. NOTE:

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

  17. Flush the A/C system. Follow the instructions supplied with the GE-48800  Air Conditioning Service Center.
  18. Disconnect the red hose from the GE-48800  CoolTech A/C Recharge Machine from GE-45268-8.
  19. Disconnect the blue hose from the GE-48800  CoolTech A/C Recharge Machine to GE-45268-1 flush filter adapter.
  20. Disconnect the GE-45268-1 flush filter from the GE-45268-10 flush adapter.
  21. Remove the GE-45268-10 from the A/C compressor hose assembly.
    22. NOTE:

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

  22. If you will reinstall the removed A/C compressor, perform the following procedure:
    1. Remove the A/C compressor drain plug.
    2. Drain the PAG oil from the A/C compressor. Rotate the compressor input shaft to assist in draining the PAG oil from the compressor.
    3. Install the A/C compressor drain plug and tighten to 30 N.m (22 lb ft).
    4. Add the total system capacity of PAG oil to the A/C compressor. Refer to Approximate Fluid Capacities (R-134a) 
  23. If you will replace the A/C compressor after flushing the system, perform the following procedure:
    1. Deduct 41 ml (1.4 oz), which is the amount of PAG oil shipped with the service compressor, from the amount of PAG oil listed in the capacities table. Refer to Approximate Fluid Capacities (R-134a) 
    2. Add the calculated amount to the compressor, as needed.
    24. NOTE:

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

  24. Add one bottle of GE-41447  R-134A A/C Tracer Dye directly to the A/C Compressor.
  25. Install the A/C compressor. Refer to Air Conditioning Compressor Replacement (LCV) Air Conditioning Compressor Replacement (LTG) Air Conditioning Compressor Replacement (LF4) Air Conditioning Compressor Replacement (LGX) 
  26. Remove the TXV block fitting nut.
  27. Disconnect the liquid line and suction hose from the GE-45268-115.
  28. Remove the TXV bolts retaining the GE-45268-115.
  29. Remove the GE-45268-115.
  30. Inspect the TXV for debris. Clean or replace as needed.
  31. Install the TXV. Refer to Air Conditioning Evaporator Thermal Expansion Valve Replacement (LCV) Air Conditioning Evaporator Thermal Expansion Valve Replacement (LTG) Air Conditioning Evaporator Thermal Expansion Valve Replacement (LF4, LGX) 
  32. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging (R-134a) 
  33. Leak test the fittings using GE-50078  Enhanced Leak Detector.
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