Flushing

Flushing (Non HP2)

Special Tools

* J 41447 Leak Detection Dye

* J 42220 Universal 12V Leak Detection Lamp

* J 43600 ACR 2000 Refrigerant Station

* J 45268 Flush Adapter Kit

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

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 (Non-HP2) Service and RepairRefrigerant Recovery and Recharging (HP2) Service and Repair.

2. Remove the orifice tube. Refer to Expansion (Orifice) Tube Replacement Service and Repair.

3. Connect the A/C lines with the orifice tube removed.

4. Remove the A/C compressor. Refer to Air Conditioning Compressor Replacement (LU3) Removal and ReplacementAir Conditioning Compressor Replacement (LZ1, L20, LC9, L9H, L92, LMG) Removal and ReplacementAir Conditioning Compressor Replacement (LGH, LML) Removal and Replacement.

5. Install 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 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 suction port of the J 45268 -3 flush adapter.

2. Connect the blue hose from the J 43600 to J 45268 -1 flush filter adapter.

3. Connect the red hose from the J 43600 to 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. Service the filter with ACDelco P/N GF 470, before each flush.

Connect the J 45268-1 flush filter to the discharge port of J 45268 -3 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 -3.

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 the J 43600.

9. Remove the J 45268 -3 from the A/C compressor hose assembly.

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.


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

11. Add back the total system capacity of PAG oil to the A/C compressor. Refer to Refrigerant System Specifications (Non-HP2) Capacity Specifications.

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 Air Conditioning Compressor Replacement (LU3) Removal and ReplacementAir Conditioning Compressor Replacement (LZ1, L20, LC9, L9H, L92, LMG) Removal and ReplacementAir Conditioning Compressor Replacement (LGH, LML) Removal and Replacement.

14. Inspect the orifice tube for debris. Clean or replace as needed.

15. Install the orifice tube. Refer to Expansion (Orifice) Tube Replacement Service and Repair.

16. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging (Non-HP2) Service and RepairRefrigerant Recovery and Recharging (HP2) Service and Repair.

17. Leak test the fittings using the J 42220.