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Flushing




Flushing

Special Tools
* J 41447 R-134A A/C Tracer Dye Box of 24
* J 42220 Universal 12V Leak Detection Lamp
* J 43600 ACR 2000 Air Conditioning Service Center
* J 45268 A/C Flush Adapter Kit

Note: Flushing with the ACR 2000 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

Forward Flushing Setup

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





Note: Inspect and lubricate J 45268 fitting O-rings. Refer to Air Conditioning O-Ring Seal Replacement Air Conditioning O-Ring Seal Replacement.

1. Install both J 45268-9 onto J 45268-10.
2. Install J 45268-7 onto suction side of J 45268-10.
3. Install J 45268-8 onto discharge side of J 45268-10.

Reverse Flushing Setup

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

Note: Inspect and lubricate J 45268 fitting O-rings. Refer to Air Conditioning O-Ring Seal Replacement Air Conditioning O-Ring Seal Replacement.

1. Install both J 45268-9 onto J 45268-10.
2. Install J 45268-8 onto suction side of J 45268-10.
3. Install J 45268-7 onto discharge side of J 45268-10.

Flush Procedure

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

1. Recover refrigerant. Refer to Refrigerant Recovery and Recharging Refrigerant Recovery and Recharging.
2. Remove thermal expansion valve (TXV). Refer to Air Conditioning Evaporator Thermal Expansion Valve Replacement Service and Repair.
3. Install TXV stud onto J 45268-115.
4. Install new sealing washers onto evaporator core. Refer to Air Conditioning System Seal Replacement Air Conditioning System Seal Replacement.
5. Install J 45268-115 in place of TXV.

Caution: Refer to Fastener Caution Fastener Caution.

6. Install TXV mounting bolts and tighten to 7 Nm (62 lb in).
7. Install new washers onto liquid line and suction hose. Refer to Air Conditioning System Seal Replacement Air Conditioning System Seal Replacement.
8. Connect liquid line and suction hose to J 45268-115.
9. Install TXV block fitting nut and tighten to 27 Nm (20 lb ft).
10. Remove A/C compressor. Refer to Air Conditioning Compressor Replacement (LZE, LZ4, LZ9) Air Conditioning Compressor Replacement (LY7) .
11. Remove A/C refrigerant filter. Refer to Air Conditioning (AC) Refrigerant Filter Replacement Service and Repair.





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

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

Note: Assure that suction and discharge ports on J 45268-10 correspond to suction and discharge ports on compressor hose assembly.

13. Install J 45268-10 to compressor hose assembly.
14. Connect J 45268-1 flush filter to J 45268-7 flush adapter.
15. Connect blue hose from J 43600 to J 45268-1 flush filter adapter.
16. Connect red hose from J 43600 to J 45268-8 flush adapter.

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

17. Flush A/C system. Follow instructions supplied with J 43600 .
18. Disconnect red hose from J 43600 to J 45268-8 flush adapter.
19. Disconnect blue hose from J 43600 to J 45268-1 flush filter adapter.
20. Disconnect J 45268-1 flush filter from J 45268-10 flush adapter.
21. Remove J 45268-10 from compressor hose assembly.

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

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

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

1. Remove A/C compressor drain plug.
2. Drain PAG oil from A/C compressor. Rotate compressor input shaft to assist in draining the PAG oil from compressor.
3. Add the total system capacity of PAG oil to A/C compressor. Refer to Refrigerant System Capacities [1][2]Capacity Specifications.

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

4. Add one bottle of J 41447 .
5. Install A/C compressor drain plug and tighten to 15 Nm (11 lb ft).

Note: A new service compressor is shipped with a full charge of PAG oil. Refer to Refrigerant System Capacities [1][2]Capacity Specifications.

23. Install A/C compressor. Refer to Air Conditioning Compressor Replacement (LZE, LZ4, LZ9) Air Conditioning Compressor Replacement (LY7) .
24. Install new A/C refrigerant filter. Refer to Air Conditioning (AC) Refrigerant Filter Replacement Service and Repair.
25. Remove TXV block fitting nut.
26. Disconnect liquid line and suction line from J 45268-115.
27. Remove TXV bolts retaining J 45268-115.
28. Remove J 45268-115.
29. Inspect TXV for debris. Clean or replace as needed.
30. Install TXV. Refer to Air Conditioning Evaporator Thermal Expansion Valve Replacement Service and Repair.
31. Evacuate and recharge A/C system. Refer to Refrigerant Recovery and Recharging Refrigerant Recovery and Recharging.
32. Leak test fittings using J 42220 .

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