Flushing

Flushing

Tools Required

* 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 Flushing Adapter Kit

Note:
Flushing with the J 43600 - 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 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 the J 45268 - A/C Flushing Adapter Kit fitting O-rings. Refer to Air Conditioning O-Ring Seal Replacement Air Conditioning O-Ring Seal Replacement.

1. Install both J 45268-9 (2) onto the J 45268-10 (3).

2. Install the J 45268-7 (4) onto the suction side of the J 45268-10 (3).

3. Install the J 45268-8 (1) onto the discharge side of the J 45268-10 (3).

Reverse Flushing Setup

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





Note:
Inspect and lubricate the J 45268 - A/C Flushing Adapter Kit fitting O-rings. Refer to Air Conditioning O-Ring Seal Replacement Air Conditioning O-Ring Seal Replacement.

1. Install both J 45268-9 (2) onto the J 45268-10 (3).

2. Install the J 45268-8 (1) onto the suction side of the J 45268-10 (3).

3. Install the J 45268-7 (4) onto the discharge side of the J 45268-10 (3).

Flush Procedure

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

1. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging Refrigerant Recovery and Recharging.

2. Remove the TXV. Refer to Air Conditioning Evaporator Thermal Expansion Valve Replacement Air Conditioning Evaporator Thermal Expansion Valve Replacement.





3. Install the stud onto the J 45268-115.

4. Install new sealing washers onto the evaporator core. Refer to Air Conditioning System Seal Replacement Air Conditioning System Seal Replacement.

5. Install J 45268-115 in place of the 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 the rear evaporator line assembly. Refer to Air Conditioning System Seal Replacement Air Conditioning System Seal Replacement.

8. Connect the rear evaporator line assembly to the J 45268-115.

9. Install the TXV block fitting nut and tighten to 20 Nm (15 lb ft).

10. Remove the A/C compressor. Refer to Air Conditioning Compressor Replacement (LEA) Removal and ReplacementAir Conditioning Compressor Replacement (LFW) Removal and Replacement.





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

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

Note:
Install new sealing washers onto the compressor hose assembly. Refer to Air Conditioning System Seal Replacement Air Conditioning System Seal Replacement.

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

12. Install the J 45268-10 to the compressor hose assembly.

13. Connect the J 45268-1 flush filter to the J 45268-7 flush adapter.





14. Connect the blue hose from the J 43600 - ACR 2000 Air Conditioning Service Center to J 45268-1 flush filter adapter.

15. Connect the red hose from the J 43600 - ACR 2000 Air Conditioning Service Center to J 45268-8 flush adapter.

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

16. Flush the A/C system. Follow the instructions supplied with the J 43600 - ACR 2000 Air Conditioning Service Center.

17. Disconnect the red hose from the J 43600 - ACR 2000 Air Conditioning Service Center to J 45268-8 flush adapter.

18. Disconnect the blue hose from the J 43600 - ACR 2000 Air Conditioning Service Center to J 45268-1 flush filter adapter.

19. Disconnect the J 45268-1 flush filter from the J 45268-10 flush adapter.

20. Remove the J 45268-10 from the compressor hose assembly.

Note:
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.

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

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.

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

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

3. Add one bottle of J 41447 - R-134A A/C Tracer Dye - Box of 24 directly to the A/C compressor.

Note:
A new service compressor is shipped with 2.5 oz of PAG oil. Refer to Refrigerant System Specifications Specifications.

22. Install the A/C compressor. Refer to Air Conditioning Compressor Replacement (LEA) Removal and ReplacementAir Conditioning Compressor Replacement (LFW) Removal and Replacement.

23. Remove the TXV block fitting nut.

24. Disconnect the rear evaporator line assembly from the J 45268-115.





25. Remove the TXV bolts retaining the J 45268-115.

26. Remove the J 45268-115.

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

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

29. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging Refrigerant Recovery and Recharging.

30. Leak test the fittings using J 42220 - Universal 12V Leak Detection Lamp.