GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2007 🢒 Corvette 🢒 HVAC 🢒 Heating, Ventilation, and Air Conditioning 🢒 Flushing

Tools Required

    • J 41447 R-134a-Leak Detection Dye
    • J 42220 Universal 12V Leak Detection Lamp
    • J 43600 ACR 2000 Air Conditioning Service Center
    • J 45268 A/C Flush Adapter Kit

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

Flushing is intended to remove the following:

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

Forward Flushing Setup

    Important: Forward flow refrigerant flushing is recommended for contaminated refrigerant or PAG oil.


    Object Number: 1162447 Size: SH

    Important: Inspect and lubricate the J 45268 fitting O-rings. Refer to O-Ring Replacement .

  1. Install both J 45268-9 (2) onto the J 45268-10 (3).
  2. Install the J 45268-7 (4) onto the suction side of the J 45268-10 (3).
  3. Install the J 45268-8 (1) onto the discharge side of the J 45268-10 (3).

Reverse Flushing Setup

    Important: Reverse flow refrigerant flush is recommended for desiccant bag failure. Replace the condenser/receiver dehydrator assembly when the A/C flush is complete and perform the following procedure:


    Object Number: 1211671 Size: SH

    Important: Inspect and lubricate the J 45268 fitting O-rings. Refer to O-Ring Replacement .

  1. Install both J 45268-9  (2) onto the J 45268-10 (3).
  2. Install the J 45268-8 (1) onto the suction side of the J 45268-10 (3).
  3. Install the J 45268-7 (4) onto the discharge side of the J 45268-10 (3).

Flush Procedure

    Important: 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 .
  2. Remove the thermal expansion valve (TXV). Refer to Thermal Expansion Valve Replacement .

    3. Object Number: 1348197 Size: SH
  3. Install the stud onto the J 45268-115.
  4. Install new sealing washers onto the evaporator core. Refer to Sealing Washer Replacement .
  5. Install J 45268-115 in place of the TXV.
  6. Install TXV mounting bolts.

    7. Tighten
    Tighten the bolts to 7 N·m (62 lb in).

  7. Install new washers onto the rear evaporator line assembly. Refer to Sealing Washer Replacement .
  8. Connect the rear evaporator line assembly to the J 45268-115.
  9. Install the TXV block fitting nut.

    10. Tighten
    Tighten the nut to 20 N·m (15 lb ft).

  10. Remove the A/C compressor. Refer to Air Conditioning Compressor Replacement .
  11. Remove the A/C refrigerant filter. Refer to Air Conditioning (AC) Refrigerant Filter Replacement .

    12. Object Number: 787687 Size: SH

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

  12. Service the filter with AC Delco P/N GF 470, before each flush.

    13. Important: Install new sealing washers onto the compressor hose assembly. Refer to Sealing Washer 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.

  13. Install the J 45268-10 to the compressor hose assembly.
  14. Connect the J 45268-1 flush filter to the J 45268-7 flush adapter.

    15. Object Number: 1348182 Size: SH
  15. Connect the blue hose from the J 43600 to J 45268-1 flush filter adapter.
  16. Connect the red hose from the J 43600 to J 45268-8 flush adapter.

    17. Important: 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 J 43600 .
  18. Disconnect the red hose from the J 43600 to J 45268-8 flush adapter.
  19. Disconnect the blue hose from the J 43600 to J 45268-1 flush filter adapter.
  20. Disconnect the J 45268-1 flush filter from the J 45268-10 flush adapter.
  21. Remove the J 45268-10 from the compressor hose assembly.

    22. 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.

  22. If you will reinstall the removed A/C compressor, perform the following procedure:

    23. Object Number: 1480098 Size: SH
    22.1. Remove the A/C compressor drain plug.
    22.2. Drain the PAG oil from the A/C compressor. Rotate the compressor input shaft to assist in draining the PAG oil from the compressor.
    22.3. Add the total system capacity of PAG oil to the crankcase of the A/C compressor . Refer to Refrigerant System Capacities .

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

    22.4. Add one bottle of J 41447 directly into the A/C compressor.
    22.5. Install the A/C compressor drain plug.

    Tighten
    Tighten the drain plug to 15 N·m (11 lb ft).

    Important: A new service compressor is shipped with a full charge of PAG oil. Refer to Refrigerant System Capacities .

  23. Install the A/C compressor. Refer to Air Conditioning Compressor Replacement .
  24. Install the A/C refrigerant filter. Refer to Air Conditioning (AC) Refrigerant Filter Replacement .
  25. Remove the TXV block fitting nut.
  26. Disconnect the rear evaporator line assembly from the J45268-115.

    27. Object Number: 1348197 Size: SH
  27. Remove the TXV bolts retaining the J 45268-115.
  28. Remove the J 45268-115.
  29. Inspect the TXV for debris. Clean or replace as needed.
  30. Install the TXV. Refer to Thermal Expansion Valve Replacement .
  31. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging .
  32. Leak test the fittings using J 42220 .