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 Flush Adapter Kit



Important: Flushing 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






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

* Inspect and lubricate the J 45268 fitting O-rings. Refer to O-Ring Replacement (Service and Repair) .



1. Install the J 45268-7 (2) onto the suction line adapter block J 45268-13 (1).
2. Install the J 45268-8 (3) onto the discharge line adapter block J 45268-12 (4).



Reverse Flushing Setup






Important:
* 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:

* Inspect and lubricate the J 45268 fitting O-rings. Refer to O-Ring Replacement (Service and Repair) .



1. Install the J 45268-8 (2) onto the suction line adapter block J 45268-13 (1).
2. Install the J 45268-7 (3) onto the discharge line adapter block J 45268-12 (4).



Flush Procedure


Important: 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 thermal expansion valve (TXV). Refer to Thermal Expansion Valve Replacement (Service and Repair) .
3. Install new O-rings onto the evaporator core and A/C lines. Refer to O-Ring Replacement (Service and Repair) .
4. Install the A/C lines into J 45268-110.
5. Install J 45268-110 onto the evaporator core.




6. Install the TXV line bracket.

Notice: Refer to Fastener Notice (Fastener Notice) .

7. Install TXV mounting bolts.

Tighten the bolts to 3.5 N.m (31 lb in).

8. Remove the A/C compressor. Refer to Air Conditioning Compressor Replacement (LH2) (Service and Repair)Air Conditioning Compressor Replacement (LY7) (Service and Repair) .





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


9. Service the filter with AC Delco P/N GF 470, before each flush.





Important: Install new O-rings onto the A/C discharge and suction lines. Refer to O-Ring Replacement (Service and Repair) .


10. Install the J 45268-13 to the A/C suction line.
11. Install the J 45268-12 to the A/C discharge line.
12. Connect the J 45268-1 flush filter to the J 45268-7 flush fitting.
13. Connect the blue hose from the J 43600 to J 45268-1 flush filter adapter.
14. Connect the red hose from the J 43600 to J 45268-8 flush fitting.

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


15. Flush the A/C system. Follow the instructions supplied with the J 43600 .
16. Disconnect the red hose from the J 43600 to J 45268-8 flush fitting.
17. Disconnect the blue hose from the J 43600 to J 45268-1 flush filter adapter.
18. Disconnect the J 45268-1 flush filter from the J 45268-7 flush fitting.
19. Remove the J 45268-12 from the A/C discharge line.
20. Remove the J 45268-13 from the A/C suction line.





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.


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

1. Remove the drain oil bolt from the removed compressor.
2. Drain and properly discard the PAG oil from the A/C compressor. Rotate the compressor input shaft to assist in draining the PAG oil from the compressor.
3. Add the total system capacity of PAG oil into the A/C compressor oil drain. Refer to Refrigerant System Capacities ([1][2]Capacity Specifications) .

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


4. Add one bottle of J 41447 directly to the A/C compressor.


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


22. Install the A/C compressor. Refer to Air Conditioning Compressor Replacement (LH2) (Service and Repair)Air Conditioning Compressor Replacement (LY7) (Service and Repair) .




23. Remove the TXV mounting bolts.
24. Remove the TXV line bracket.




25. Remove J 45268-110 from the evaporator core.
26. Remove the A/C lines from J 45268-110.
27. Inspect the TXV for debris. Clean or replace as needed.
28. Replace the desiccant bag. Refer to Air Conditioning Refrigerant Desiccant Replacement (Service and Repair) .
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 .