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Flushing

Flushing



Special Tools

• GE-8800 ACR 2000 Air Conditioning Service Center

• GE-45268 Flush Adapter Kit

• GE-41447 Leak Detection Dye

• GE-42220 Universal 12V Leak Detection Lamp


For equivalent regional tools. Refer to Special Tools


Note

Flushing with the GE-8800 ACR 2000 Air Conditioning Service Center is not intended to remove metal from the A/C system.


Flushing is intended to remove the following:


• Contaminated polyalkylene glycol (PAG) oil

• Desiccant, following a desiccant bag failure

• Overcharge of PAG oil

• Refrigerant contamination




1.
Note

Warmer engine or ambient temperature decreases the refrigerant recovery time during the A/C flush procedure.


Recover the refrigerant. Refer to Refrigerant Recovery and Recharging (Belt Driven Compressor)

2. Remove the thermal expansion valve (TXV). Refer to Air Conditioning Evaporator Thermal Expansion Valve Replacement

3. Install the stud for the GE 45268 Flush Adapter Kit kit onto the GE 45268-121.

4. Install the GE 45268-121 in place of the TXV.

5. Refer to Fastener Caution

Install the TXV mounting bolts.

Tighten

Tighten the bolts to 7 Nm (62 lb in).

6. Connect the evaporator line to the GE 45268-121.

7. Install the TXV block fitting nut.

Tighten

Tighten the bolts to 17 Nm (12.5 lb ft).

8. Remove the A/C compressor. Refer to A/C compressor, replacement (LF1) A/C compressor, replacement (LAU)

9. Install GE 45268-10 to the A/C compressor hose assembly.

10. Install the nut and bolt from the GE 45268 Flush Adapter Kit kit to the GE 45268-10 and compressor hose assembly.

Tighten

Tighten the bolts to 17 Nm (12.5 lb ft).

11. Forward flow refrigerant flushing is recommended for contaminated refrigerant or PAG oil.

Perform the following procedure:

11.1.
Note

The filter inside GE 45268-1 is serviceable. Remove and discard the check valve from the filter.


Service the filter with ACDelco P/N GF 470, before each flush.


11.2. Install the port plugs GE 45268-9 onto the GE 45268-10.

11.3. Install the fitting GE 45268-7 onto the GE 45268-10.

11.4. Install the fitting GE 45268-8 onto the GE 45268-10.

11.5. Connect GE 45268-1 flush filter to the suction port of GE 45268-7 flush adapter.

11.6. Connect the blue hose from the GE 8800 ACR 2000 Air Conditioning Service Center to the GE 45268-1 flush filter adapter.

11.7. Connect the red hose from the GE 8800 ACR 2000 Air Conditioning Service Center to the GE 45268-8 flush adapter.

12. Reverse flow refrigerant flush is recommended for desiccant bag failure. Replace the A/C condenser when the A/C flush is complete and perform the following procedure:

12.1.
Note

The filter inside GE 45268-1 is serviceable. Remove and discard the check valve from the filter.


Service the filter with ACDelco P/N GF 470, before each flush.

12.2. Install the port plugs GE 45268-9 onto the J 45268-10.

12.3. Install the fitting GE 45268-7 onto the J 45268-10.

12.4. Install the fitting GE 45268-8 onto the J 45268-10.

12.5. Connect GE 45268-1 flush filter to the discharge port of GE 45268-7 flush adapter.

12.6. Connect the blue hose from the GE 8800 ACR 2000 Air Conditioning Service Center to the GE 45268-1 flush filter adapter.

12.7. Connect the red hose from the GE 8800 ACR 2000 Air Conditioning Service Center to the GE 45268-8 flush adapter.

13.
Note

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


Flush the A/C system. Follow the instructions for the GE 8800 ACR 2000 A/C service center.

14. Disconnect the red hose on the GE 8800 ACR 2000 Air Conditioning Service Center from the GE 45268-10.

15. Disconnect the blue hose on the GE 8800 ACR 2000 Air Conditioning Service Center from the GE 45268-1.

16. Remove GE 45268-1 from the GE 45268-10.

17. Remove the GE 45268-10 from the A/C compressor hose assembly.

18.
Note

The A/C system must be replenished with the correct amount of PAG oil.

Flushing will remove all the PAG oil from the A/C system.


If you will reinstall the removed A/C compressor, perform the following procedure:

18.1. Remove the A/C compressor drain plug.

18.2. Drain the PAG oil from the A/C compressor. Rotate the compressor input shaft to assist in draining the PAG oil from the compressor.

18.3. Install the A/C compressor drain plug.

Tighten

Tighten the drain plug to 16 Nm (12 lb ft).

18.4. Add the total system capacity of PAG oil to the A/C compressor. Refer to Refrigerant System Specifications

19. If you will replace the A/C compressor after flushing the system, perform the following procedure:

19.1. Determine if the new service compressor is shipped with PAG oil. Refer to Refrigerant System Specifications

19.2. If the service compressor is shipped with PAG oil, DO NOT drain the new PAG oil from the compressor.

19.3. 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 Specifications

19.4. Add the calculated amount to the compressor, as needed.

20.
Note

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


Add one bottle of GE 41447 Leak Detection Dye directly to the A/C Compressor.

21. Fit the A/C compressor. Refer to A/C compressor, replacement (LF1) A/C compressor, replacement (LAU)

22. Remove GE 45268-121.

23. Inspect the TXV for debris. Clean or replace as needed.

24. Install the TXV. Refer to Air Conditioning Evaporator Thermal Expansion Valve Replacement

25. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging (Belt Driven Compressor)

26. Leak test the fittings using GE 42220 Universal 12V Leak Detection Lamp