Repair Instructions: Flushing

Special Tools

• J 41447  Leak Detection Dye
• J 42220  Universal 12V Leak Detection Lamp
• J 43600 ACR 2000 Air Conditioning Service Center
• J 45268  Flush Adapter Kit

Flushing is intended to remove the following contaminants:

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

NOTE:

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 Air Conditioning Evaporator Thermal Expansion Valve Replacement .
3. Install the J 45268-113.
4. Remove the A/C compressor. Refer to Air Conditioning Compressor Replacement (With VB6) , Air Conditioning Compressor Replacement (Without VB6) .
5. Install the J 45268-4 to the suction hose.
6. Install the J 45268-5 to the discharge hose.
Fig 1: View Of A/C Filter & Check Valve
Courtesy of GENERAL MOTORS COMPANY
7. Forward flow refrigerant flushing is recommended for contaminated refrigerant or PAG oil.

   Perform the following procedure:

   NOTE:

   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 J 45268-4 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 45268-5.
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:
   NOTE:

   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.
   2. Connect J 45268-1 flush filter to the J 45268-5 flush adapter.
   3. Connect the blue hose from J 43600 to J 45268-1 flush filter adapter.
   4. Connect the red hose from J 43600 to the J 45268-4.
NOTE:

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

9. Flush the A/C system. Follow the instructions supplied with the J 43600 .
10. Remove the J 45268-5 from the discharge hose.
11. Remove the J 45268-4 from the suction hose.
NOTE:

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.

12. If the removed A/C compressor will be reinstalled, perform the following procedure:
    1. Drain the PAG oil from the A/C compressor.

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

    2. Add the total system capacity of PAG oil to the A/C compressor. Refer to Refrigerant System Specifications .
13. If the A/C compressor will be replaced after flushing the system, refer to Air Conditioning Compressor Oil Balancing .
NOTE:

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

14. Add one bottle of J 41447  directly to the A/C compressor.
15. Install the A/C compressor. Refer to Air Conditioning Compressor Replacement (With VB6) , Air Conditioning Compressor Replacement (Without VB6) .
16. Inspect the TXV for debris. Clean or replace as needed.
17. Install the TXV. Refer to Air Conditioning Evaporator Thermal Expansion Valve Replacement .
18. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging .
19. Leak test the fittings using J 42220 .