GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 HUMMER 🢒 2009 🢒 H3 🢒 HVAC 🢒 Heating, Ventilation, and Air Conditioning 🢒 Flushing

Tools Required

    • J 43600 Air Conditioning Service Center
    • J 45268 Flush Adapter Kit
    • J 41447 Leak Detection Dye
    • J 42220 Universal 12V Leak Detection Lamp

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:

    • Contaminated polyalkyline glycol (PAG) oil
    • Desiccant, following a desiccant bag failure
    • Overcharge of PAG oil
    • Refrigerant contamination

    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 thermal expansion valve (TXV). Refer to Thermal Expansion Valve Replacement .
  3. Install J 45268 - 103.
  4. Remove the A/C compressor. Refer to Air Conditioning Compressor Replacement .
  5. Install J 45268 - 5 to the discharge hose.
  6. Install J 45268 - 4 to the suction hose.

    7. Object Number: 787687 Size: SH
  7. Forward flow refrigerant flushing is recommended for contaminated refrigerant or PAG oil.

    8. Perform the following procedure:

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

    7.1. 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 - 4 flush adapter.

    7.2. Connect the blue hose from J 43600 to J 45268 - 1 flush filter adapter.
    7.3. Connect the red hose from J 43600 to J 45268 - 5 flush adapter.
  8. Reverse flow refrigerant flush is recommended for desiccant bag failure. Replace the receiver dehydrator when the A/C flush is complete and perform the following procedure:

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

    8.1. Service the filter with ACDelco P/N GF 470, before each flush. Connect J 45268 - 1 flush filter to the discharge port of J 45268 - 5 flush adapter.
    8.2. Connect the blue hose from J 43600 to J 45268 - 1 flush filter adapter.
    8.3. Connect the red hose from J 43600 to the suction port of J 45268 - 4 flush adapter.
  9. Flush the A/C system. Follow the instructions supplied with J 43600 . Close the valve on the external refrigerant tank, before starting the flush process.
  10. Remove J 45268 - 4 from the suction hose.
  11. Remove J 45268 - 5 from the discharge hose.
  12. Remove J 45268 - 1 from J 43600 .

    13. 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.

  13. Drain the PAG oil from the A/C compressor.

    14. Rotate the compressor input shaft to assist in draining the PAG oil from the compressor.

  14. Add the total system capacity of PAG oil to the A/C compressor. Refer to Refrigerant System Capacities .

    15. Important: Flushing will remove the fluorescent leak detection dye from the A/C system.

  15. Add one bottle of J 41447 directly to the A/C compressor.
  16. Install the A/C compressor. Refer to Air Conditioning Compressor Replacement .
  17. Remove J 45268 - 103.
  18. Install new seal washers. Refer to Sealing Washer Replacement .
  19. Inspect the TXV for debris. Clean or replace as needed.
  20. Install the TXV. Refer to Thermal Expansion Valve Replacement .
  21. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging .
  22. Leak test the fittings using J 42220 .