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Repair Instructions: Flushing

WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

Tools Required

IMPORTANT: Flushing is not intended to remove metal from the A/C system.

Flushing is intended to remove the following:

    IMPORTANT: Warmer engine or ambient temperature decreases the refrigerant recovery time during the A/C flush procedure.
  1. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging .
  2. Remove the orifice tube. Refer to Expansion (Orifice) Tube Replacement (Body VIN Code 3) Expansion (Orifice) Tube Replacement (Body VIN Code 6) .
  3. Connect the A/C lines with the orifice tube removed.
  4. Remove the A/C compressor. Refer to Compressor Replacement (Body Type VIN 3) .
  5. Install the J 45268-2 to the A/C compressor suction hose.
  6. Install the J 45268-2 to the A/C compressor discharge hose.
    7. Fig 1: View Of A/C Filter And Check Valve
    GM787687Courtesy of GENERAL MOTORS CORP.
  7. Forward flow refrigerant flushing is recommended for contaminated refrigerant or PAG oil.

    Perform the following procedure:

      IMPORTANT: The filter inside the J 45268-1 is serviceable. Remove and discard the check valve from the filter.
    1. Service the filter with AC Delco P/N GF 470, before each flush.

      Connect the J 45268-1 flush filter to the suction port of the J 45268-4 flush adapter.

    2. Connect the blue hose from the J 43600  to the J 45268-1 flush filter adapter. See Special Tools and Equipment .
    3. Connect the red hose from the J 43600  to the J 45268-5 flush adapter. See Special Tools and Equipment .
  8. Reverse flow refrigerant flushing is recommended for desiccant bag failure.

    Perform the following procedure and replace the accumulator when the flush procedure is complete.

      IMPORTANT: The filter inside the J 45268-1 is serviceable. Remove and discard the check valve from the filter.
    1. Service the filter with AC Delco P/N GF 470, before each flush.

      Connect the J 45268-1 flush filter to the discharge port of the J 45268-5 flush adapter.

    2. Connect the blue hose from the J 43600  to the J 45268-1 flush filter adapter. See Special Tools and Equipment .
    3. Connect the red hose from the J 43600  to the suction port of the J 45268-4 flush adapter. See Special Tools and Equipment .
  9. Flush the front A/C system. Follow the instructions supplied with the J 43600  . See Special Tools and Equipment .

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

    10. IMPORTANT: Flush the front A/C system before flushing the auxiliary A/C system.
  10. If the vehicle is equipped with rear A/C, flush the auxiliary A/C system separately.
    11. Fig 2: Orifice Tube Frame & Screen
    GM756678Courtesy of GENERAL MOTORS CORP.
  11. Cut the orifice tube frame and screen, enough to access the end of the orifice tube. Pinch off the orifice tube.
    12. Fig 3: Orifice Tube
    GM756680Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Pinch off the orifice tube in order to prevent refrigerant flow to the front system during the auxiliary system flush.
  12. Install the pinched orifice tube. Refer to Expansion (Orifice) Tube Replacement (Body VIN Code 3) Expansion (Orifice) Tube Replacement (Body VIN Code 6) .
  13. Remove the auxiliary TXV. Refer to Thermal Expansion Valve Replacement - Auxiliary .
  14. Install the J 45268-108.
    15. IMPORTANT: The auxiliary evaporator core can be flushed without totally reassembling into the auxiliary HVAC module.
  15. Install the auxiliary evaporator core to the A/C lines.
  16. Raise the vehicle. Refer to LIFTING AND JACKING THE VEHICLE in General Information.
  17. Connect the auxiliary A/C lines to the auxiliary evaporator core.
  18. Lower the vehicle.
  19. Flush the auxiliary A/C system. Follow the instructions supplied with the J 43600  . See Special Tools and Equipment .
  20. Raise the vehicle. Refer to LIFTING AND JACKING THE VEHICLE in General Information.
  21. Remove the auxiliary A/C lines from the auxiliary evaporator core.
  22. Lower the vehicle.
  23. Remove the J 45268-108.
  24. Inspect the TXV for debris.

    Clean or replace as needed.

  25. Install the auxiliary TXV. Refer to Thermal Expansion Valve Replacement - Auxiliary .
  26. Remove the J 45268-2 from the A/C compressor hose assembly.
    • Drain the PAG oil from the A/C compressor, through the suction and discharge ports.
    • Rotate the compressor input shaft to assist in draining the PAG oil from the A/C compressor.
    27. IMPORTANT: Flushing will remove the fluorescent leak detection dye from the A/C system.
  27. Add one bottle of J 41447  directly to the A/C compressor. See Special Tools and Equipment .
  28. Install the A/C compressor. Refer to Compressor Replacement (Body Type VIN 3) .
  29. Install a new orifice tube. Refer to Expansion (Orifice) Tube Replacement (Body VIN Code 3) Expansion (Orifice) Tube Replacement (Body VIN Code 6) .
  30. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging .
    31. IMPORTANT: Flushing will remove all of the PAG oil from the A/C system.
  31. Add the total system capacity of PAG oil to the A/C system. Refer to Refrigerant System Capacities .
  32. Leak test the fittings using the J 42220  . See Special Tools and Equipment .
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