Repair Instructions: Flushing

Tools Required

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

IMPORTANT: Flushing with the ACR 2000 is not intended to remove metal from the A/C system.
1. 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.
2. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging .
3. Remove the orifice tube. Refer to Expansion (Orifice) Tube Replacement .
4. Connect the A/C lines with the orifice tube removed.
5. Remove the A/C compressor. Refer to Compressor Replacement .
6. Install the J 45268-3 to the A/C compressor hose assembly.
Fig 1: View Of A/C Filter And Check Valve
Courtesy 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 ACDelco P/N GF 470, before each flush.

      Connect the J 45268-1 flush filter to the suction port of the J 45268-3 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 45268-3. See Special Tools and Equipment .
8. Reverse flow refrigerant flushing is recommended for desiccant bag failure only.

   Perform the following procedure and replace the accumulator when the flush 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 ACDelco P/N GF 470, before each flush.

      Connect the J 45268-1 flush filter to the discharge port of the J 45268-3 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 45268-3. See Special Tools and Equipment .
9. Flush the 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. Remove the J 45268-3 from the A/C compressor hose assembly.
11. Remove the A/C compressor drain plug.
12. Install the A/C compressor drain plug.

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

13. If replacing the A/C compressor after flushing the system, perform the following:
    • Determine if the new service compressor is shipped with PAG oil. Refer to Refrigerant System Capacities .
    • If the service compressor is shipped with PAG oil, DO NOT DRAIN the new PAG oil from the compressor.
    • 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 . Add the calculated amount to the compressor, as needed.
    • 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 .
    IMPORTANT: Flushing will remove the fluorescent leak detection dye from the A/C system.
    • Add one bottle of J 41447  directly to the A/C compressor. See Special Tools and Equipment .
14. Install the A/C compressor. Refer to Compressor Replacement .
15. Inspect the orifice tube for debris.

    Clean or replace as needed.

16. Install the orifice tube. Refer to Expansion (Orifice) Tube Replacement .
17. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging .
IMPORTANT: Flushing will remove all the PAG oil from the A/C system.
18. Add the total system capacity of PAG oil to the A/C system. Refer to Refrigerant System Capacities .
19. Leak test the fittings using the J 42220  . See Special Tools and Equipment .