Repair Instructions: Flushing

Tools Required

• J 43600  Air Conditioning Service Center. See Special Tools and Equipment .
• J 45268  Flush Adapter Kit. See Special Tools and Equipment .
• J 41447  Leak Detection Dye. See Special Tools and Equipment .
• J 42220  Universal 12V Leak Detection Lamp. See Special Tools and Equipment .

Flushing is intended to remove the following contaminants:

• Contaminated PAG oil
• Desiccant, following a desiccant bag failure
• Overcharge of PAG oil
• Refrigerant contamination

1. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging .
2. Remove the orifice tube. Refer to Expansion (Orifice) Tube Replacement .
3. Connect the A/C lines with the orifice tube removed.
4. Remove the A/C compressor. Refer to Compressor Replacement .
5. Install J 45268  - 10 to the A/C compressor hose assembly.
6. 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 AC Delco P/N GF 470, before each flush.

      Connect J 45268  - 1 flush filter to the suction port of.J 45268  - 10 flush adapter.

   2. Connect the blue hose from J 43600  to J 45268  - 1 flush filter adapter.
   3. Connect the red hose from J 43600  to J 45268  - 10.
7. 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 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 discharge port of J 45268  - 10 flush adapter.

      Fig 1: View Of A/C Filter And Check Valve

      Courtesy of GENERAL MOTORS CORP.
   2. Connect the blue hose from J 43600  to J 45268  - 1 flush filter adapter.
   3. Connect the red hose from J 43600  to the suction port of J 45268  - 10.
   IMPORTANT: Close the valve on the external refrigerant tank before starting the flush process.
8. Flush the A/C system. Follow the instructions supplied with J 43600  .
9. Remove J 45268  - 10 from the A/C compressor hose assembly.
   IMPORTANT: Flushing will remove all the PAG oil from the A/C system. Replenish the A/C system with the correct amount of PAG oil.
10. If the removed A/C compressor will be reinstalled, perform the following steps:
    1. Remove the A/C compressor drain plug.
    2. Rotate the compressor input shaft to assist in draining the PAG oil from the compressor.
    3. Drain the PAG oil from the A/C compressor.
    4. Install the A/C compressor drain plug.

       Tighten:  Tighten the drain plug to 15 N.m (10 lb ft).

    5. Add the total system capacity of PAG oil to the A/C compressor. Refer to Refrigerant System Capacities (L61) .
11. If you are replacing the A/C compressor after flushing the system, perform the following steps:
    1. 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 (L61) .
    2. Add the calculated amount of oil to the compressor, as needed.
    IMPORTANT: Flushing will remove the fluorescent leak detection dye from the A/C system.
12. Add one bottle of J 41447  directly to the A/C compressor.
13. Install the A/C compressor. Refer to Compressor Replacement .
14. Inspect the orifice tube for debris. Clean or replace as needed.
15. Install the orifice tube. Refer to Expansion (Orifice) Tube Replacement .
16. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging .
17. Leak test the fittings using J 42220  .