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

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 J 45268  - 103. See Special Tools and Equipment .
4. Remove the A/C compressor. Refer to Compressor Replacement .
5. Install J 45268  - 5 to the discharge hose. See Special Tools and Equipment .
6. Install J 45268  - 4 to the suction hose. See Special Tools and Equipment .
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 J 45268  - 1 is serviceable. See Special Tools and Equipment . 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 suction port of 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 flush adapter.
8. Reverse flow refrigerant flush 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 J 45268  - 1 is serviceable. See Special Tools and Equipment . 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  - 5 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 the suction port of J 45268  - 4 flush adapter.
9. Flush the A/C system. Follow the instructions supplied with J 43600  . See Special Tools and Equipment . Close the valve on the external refrigerant tank, before starting the flush process.
10. Remove J 45268  - 4 from the suction hose. See Special Tools and Equipment .
11. Remove J 45268  - 5 from the discharge hose. See Special Tools and Equipment .
12. Remove J 45268  - 1 from J 43600  . See Special Tools and Equipment .
IMPORTANT: 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.
13. If you will reinstall the removed A/C compressor, 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 Capacities .
14. If you will replace the A/C compressor after flushing the system, perform the following procedure:
    1. A new service compressor is shipped with PAG oil. Refer to the Refrigerant System Capacities .
    2. 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.
IMPORTANT: Flushing will remove the fluorescent leak detection dye from the A/C system.
15. Add one bottle of J 41447  directly to the A/C compressor. See Special Tools and Equipment .
16. Install the A/C compressor. Refer to Compressor Replacement .
17. Remove J 45268  - 103. See Special Tools and Equipment .
18. Install new seal washers. Refer to Sealing Washer Replacement .
19. Inspect the TXV for debris. Clean or replace as needed.
20. Install the TXV. Refer to Thermal Expansion Valve Replacement .
21. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging .
22. Leak test the fittings using J 42220  . See Special Tools and Equipment .