Tools Required

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

Flushing is intended to remove the following:

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 Air Conditioning Compressor Replacement .
5. Install the 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 the J 45268-1 is serviceable. Remove and discard the check valve from the filter.

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

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

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

6.3.	Connect the red hose from the J 43600 to the 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.

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

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

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

7.3.	Connect the red hose from the J 43600 to the suction port of the J 45268-3.

8. Flush the A/C system. Follow the instructions supplied with the J 43600 .

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

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

•	Remove the A/C compressor drain plug.

•	Drain the PAG oil from the A/C compressor.

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

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

•	Install the A/C compressor drain plug.

Tighten
Tighten the drain plug to 20 N·m (15 lb ft).

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

10. Add one bottle of J 41447 .

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

11. Add the total system capacity of PAG oil to the A/C compressor. Refer to Refrigerant System Capacities .
12. Install the A/C compressor. Refer to Air Conditioning Compressor Replacement .
13. Inspect the orifice tube for debris. Refer to Expansion (Orifice) Tube Replacement

Clean or replace as needed.

14. Install the orifice tube. Refer to Expansion (Orifice) Tube Replacement .
15. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging .
16. Leak test the fittings using the J 42220 .