SMU - Revised Flushing Procedure

This bulletin is being issued to revise the Flushing Procedure in the Heating, Ventilation and Air Conditioning sub-section of the Service Manual. Please replace the current information in the Service Manual with the following information.

The following information has been updated within SI. If you are using a paper version of this Service Manual, please make a reference to this bulletin on the affected page.

Tools Required

Important: Flushing with the ACR 2000 is not intended to remove metal from the A/C system.

Flushing is intended to remove the following contaminants:

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.
5. Install the J 45268 - 4 to the suction hose.
6. Install the J 45268 - 5 to the discharge hose.



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. Remove and discard the check valve from the filter.

7.1.	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.

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

7.3.	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:

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

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

8.2.	Connect J 45268 - 1 flush filter to the J 45268 - 5 flush adapter.

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

8.4.	Connect the red hose from J 43600 to the J 45268 - 4.

Important: 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.

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.
12. If the removed A/C compressor will be reinstalled, perform the following procedure:

12.1.

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

12.2.

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

13. If the A/C compressor will be replaced after flushing the system, refer to Compressor Oil Balancing.

Important: 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 Compressor Replacement.
16. Inspect the orifice tube for debris. Clean or replace as needed.
17. Install the orifice tube. Refer to Expansion (Orifice) Tube Replacement.
18. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging.
19. Leak test the fittings using J 42220.