Repair Instructions: Flushing

Tools Required 

• J 43600  ACR 2000 Air Conditioning Service Center
• J 45268  A/C Flushing Adapter Kit
• J 41447  R-134A A/C Tracer Dye - Box of 24
• J 41459  R-134A - A/C Tracer Dye Injector
• J 42220  Universal 12V Leak Detection Lamp

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

  Flushing is intended to remove the following:

• Contaminated 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 TXV. Refer to Thermal Expansion Valve Replacement .
3. Install the J 45268-103 in place of the TXV.
4. Remove the auxiliary TXV. Refer to THERMAL EXPANSION VALVE REPLACEMENT - Auxiliary .
5. Install the J 45268-107 in place of the auxiliary TXV.
6. Remove the A/C compressor. Refer to Compressor Replacement .
7. Install the J 45268-5 to the discharge hose.
8. Install the J 45268-4 to the suction hose.
9. Forward flow refrigerant flushing is recommended for contaminated refrigerant or PAG oil.

   Perform the following procedure:

   Fig 1: Removing Check Valve From Filter

   Courtesy of GENERAL MOTORS CORP.

   Important:  The filter inside the 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.
   2. Connect the J 45268-1 to the suction port of the J 45268-4.
   3. Connect the blue hose from the J 43600  to the J 45268-1  flush filter adapter.
   4. Connect the red hose from the J 43600  to the J 45268-5 flush adapter.
10. Reverse flow refrigerant flushing is recommended for desiccant bag failure.

    Replace the receiver dehydrator when the A/C flush is complete and perform the following procedure:

    Important:  The filter inside the J 45268-1 is serviceable.

    1. Service the filter with ACDelco P/N GF 470, before each flush.
    2. Connect the J 45268-1 to the discharge port of the J 45268-5.
    3. 10.3. Connect the blue hose from the J 43600  to the J 45268-1 flush filter adapter.
    4. Connect the red hose from the J 43600  to the suction port of the J 45268-4 flush adapter.
11. Flush the front A/C system. Follow the instructions supplied with the J 43600. 

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

    Important:  Flush the front A/C system before flushing the auxiliary A/C system.

12. If the vehicle is equipped with rear A/C, flush the auxiliary A/C system separately.
    1. Remove the J 45268-107 from the auxiliary evaporator core.
    2. Remove the J 45268-103 from the front evaporator core.
    3. Install the J 45268-103 to the auxiliary evaporator core.
    4. Install the J 45268-107 to the front evaporator core.
13. Flush the auxiliary A/C system. Follow the instructions supplied with the J 43600. 
14. Remove the J 45268-5 from the discharge hose.
15. Remove the J 45268-4 from the suction hose.
16. 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.

17. Install the A/C compressor. Refer to Compressor Replacement .
18. Remove the J 45268-103.
19. Inspect the TXV for debris. Clean or replace as needed.
20. Install the auxiliary TXV. Refer to THERMAL EXPANSION VALVE REPLACEMENT - Auxiliary .
21. Remove the J 45268-107.
22. Inspect the TXV for debris. Clean or replace as needed.
23. Install the TXV. Refer to Thermal Expansion Valve Replacement .
24. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging .

    Important:  Flushing will remove all of the PAG oil from the A/C system.

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

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

26. Add one bottle of J 41447  using the J 41459. 
27. Leak test the fittings using the J 42220.