Repair Instructions: Flushing

Tools Required 

• J 43600  Air Conditioning Service Center
• J 45268  Flush Adapter Kit
• J 41447  Leak Detection Dye
• J 41459  Leak Detection 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
  Fig 1: Filter & Check Valve

  Courtesy of GENERAL MOTORS CORP.

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 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 (3.1 L)  or Compressor Replacement (3.8L) .
5. Install the J 45268-3 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 the J 45268-1 is serviceable. Remove and discard the check valve from the filter.

   1. 6.1. 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. 6.2. Connect the blue hose from the J 43600  to the J 45268-1 flush filter adapter.
   3. 6.3. Connect the red hose from the J 43600  to the J 45268-3.
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 the J 45268-1 is serviceable. Remove and discard the check valve from the filter.

   1. 7.1. 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. 7.2. Connect the blue hose from the J 43600  to the J 45268-1 flush filter adapter.
   3. 7.3. Connect the red hose from the J 43600  to the suction port of the J 45268-3.
8. Flush the A/C system. Follow the instructions supplied with the J 43600  .

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

9. Remove the J 45268-3 from the A/C compressor hose assembly.
   • Remove the A/C compressor drain plug.
   • Drain the PAG oil from the A/C compressor.

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

   • Install the A/C compressor drain plug.

     Tighten 

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

10. Install the A/C compressor. Refer to Compressor Replacement (3.1L)  or Compressor Replacement (3.8L) .
11. Inspect the orifice tube for debris.

    Clean or replace as needed.

12. Install the orifice tube. Refer to Expansion (Orifice) Tube Replacement .
13. 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.

14. 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.

15. Add one bottle of J 41447  using the J 41459  .
16. Leak test the fittings using the J 42220  .