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Flushing (Auxiliary System)

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Tools Required

IMPORTANT: Flushing with the ACR 2000 is not intended to remove metal from the A/C system.

Flushing is intended to remove the following contaminants:

    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 (Front Only System)  or Expansion (Orifice) Tube Replacement (Auxiliary System) .
  3. Connect the A/C lines with the orifice tube removed.
  4. Remove the A/C compressor. Refer to Compressor Replacement (LL8)  or Compressor Replacement (LM4) .
  5. Inspect the end of the suction hose for a suction screen.
  6. Remove the suction screen, if installed.
  7. Install J 45268-2  to the A/C compressor hose assembly. See Special Tools and Equipment .
    8. Fig 1: View Of A/C Filter And Check Valve
    GM787687Courtesy of GENERAL MOTORS CORP.
  8. Forward flow refrigerant flushing is recommended for contaminated refrigerant or PAG oil.

    Perform the following procedure:

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

      Connect J 45268  -1 flush filter to the suction port of J 45268-2  flush adapter. See Special Tools and Equipment .

    2. Connect the blue hose from J 43600  to J 45268-1  flush filter adapter. See Special Tools and Equipment .
    3. Connect the red hose from J 43600  to J 45268-2  flush adapter. See Special Tools and Equipment .
  9. 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 J 45268-1  is serviceable. See Special Tools and Equipment . Remove and discard the check valve from the filter.
    1. Service the filter with ACDelco P/N GF 470, before each flush.
    2. Connect J 45268-1  flush filter to the discharge port of J 45268-2  flush adapter. See Special Tools and Equipment .
    3. Connect the blue hose from J 43600  to J 45268-1  flush filter adapter. See Special Tools and Equipment .
    4. Connect the red hose from J 43600  to the suction port of J 45268-2  flush adapter. See Special Tools and Equipment .
    10. IMPORTANT: Close the valve on the external refrigerant tank, before starting the flush process.
  10. Flush the front A/C system. Follow the instructions supplied with the J 43600  . See Special Tools and Equipment .
    11. IMPORTANT: Flush the front A/C system before flushing the auxiliary A/C system.
  11. If the vehicle is equipped with rear A/C, flush the auxiliary A/C system separately.
    12. Fig 2: Cutting Orifice Tube & Frame
    GM756678Courtesy of GENERAL MOTORS CORP.
  12. Cut the orifice tube frame and screen, enough to access the end of the orifice tube. Pinch off the orifice tube.
    13. Fig 3: Pinching Off 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.
  13. Install the pinched orifice tube. Refer to Expansion (Orifice) Tube Replacement (Front Only System)  or Expansion (Orifice) Tube Replacement (Auxiliary System) .
  14. Remove the auxiliary TXV. Refer to Thermal Expansion Valve Replacement - Auxiliary .
  15. Install J 45268  -108. See Special Tools and Equipment .
    16. IMPORTANT: The auxiliary evaporator core can be flushed without totally reassembling into the auxiliary HVAC module.
  16. Install the auxiliary evaporator core to the A/C lines.
  17. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  18. Connect the auxiliary A/C lines to the auxiliary evaporator core.
  19. Lower the vehicle.
  20. Flush the auxiliary A/C system. Follow the instructions supplied with the J 43600  . See Special Tools and Equipment .
  21. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  22. Remove the auxiliary A/C lines from the auxiliary evaporator core.
  23. Lower the vehicle.
  24. Remove J 45268-108  . See Special Tools and Equipment .
  25. Inspect the TXV for debris.

    Clean or replace as needed.

  26. Install the auxiliary TXV. Refer to Thermal Expansion Valve Replacement - Auxiliary .
  27. Remove J 45268-2  from the A/C compressor hose assembly. See Special Tools and Equipment .
    28. IMPORTANT: 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.
  28. If the removed A/C compressor is being reinstalled, 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.

      Tighten:  Tighten the drain plug to 20 N.m (15 lb ft).

    4. Add the total system capacity of PAG oil to the A/C compressor. Refer to Refrigerant System Capacities .
  29. If you replace the A/C compressor after flushing the system, perform the following procedure:
    1. Determine if the new service compressor is shipped with PAG oil. Refer to the Refrigerant System Capacities .
    2. If the service compressor is shipped with PAG oil, DO NOT drain the new PAG oil from the compressor.
    3. Deduct the amount of PAG oil shipped with the service compressor from the amount of PAG oil listed in the capacities table. Refer to Refrigerant System Capacities .
    4. Add the calculated amount to the compressor, as needed.
    5. If the service compressor is shipped dry, no calculation is required. Add the total system capacity of PAG oil to the compressor. Refer to Refrigerant System Capacities .
    30. IMPORTANT: Flushing will remove the fluorescent leak detection dye from the A/C system.
  30. Add one bottle of J 41447  directly to the A/C compressor. See Special Tools and Equipment .
  31. Install the A/C compressor. Refer to Compressor Replacement (LL8)  or Compressor Replacement (LM4) .
  32. Install a new orifice tube. Refer to Expansion (Orifice) Tube Replacement (Front Only System)  or Expansion (Orifice) Tube Replacement (Auxiliary System) .
  33. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging .
  34. Leak test the fittings using J 42220  . See Special Tools and Equipment .
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