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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 Flushing Adapter Kit

Note: Flushing with the J 43600 .

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 the sealing washers J 45268 . Refer to Sealing Washer Replacement (Service and Repair).

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 . Refer to Sealing Washer Replacement (Service and Repair).

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 thermal expansion valve (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 Sealing Washer Replacement (Service and Repair).
5. Install J 45268-115 in place of the TXV.
Caution: Refer to Fastener Caution (Fastener Caution).

6. Install TXV mounting bolts.

Tighten the bolts to 7 Nm (62 lb in).

7. Install new washers onto the condenser tube and evaporator hose. Refer to Sealing Washer Replacement (Service and Repair).
8. Connect the condenser tube and evaporator hose to the J 45268-115.
9. Install the TXV block fitting nut.

Tighten the nut to 20 Nm (15 lb ft).

10. Remove the A/C compressor. Refer to Air Conditioning Compressor Replacement (Service and Repair).
11. Remove the A/C refrigerant filter. Refer to Air Conditioning Evaporator Thermal Expansion Valve Screen Replacement (Air Conditioning Evaporator Thermal Expansion Valve Screen Replacement).





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

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

Note: Install new sealing washers onto the compressor hose assembly. Refer to Sealing Washer Replacement (Service and Repair).

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

13. Install the J 45268-10 to the compressor hose assembly.
14. Connect the J 45268-1 flush filter to the J 45268-7 flush adapter.




15. Connect the blue hose from the J 43600 .
16. Connect the red hose from the J 43600 .

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

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

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




1. Remove the A/C compressor drain plug.
2. Drain 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 to the crankcase of the A/C compressor. Refer to Refrigerant System Capacities (Capacity Specifications).

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

4. Add one bottle of J 41447 .
5. Install the A/C compressor drain plug.

Tighten the drain plug to 15 Nm (11 lb ft).

Note: A new service compressor is shipped with a partial charge of PAG oil. Refer to Refrigerant System Capacities (Capacity Specifications).

23. Install the A/C compressor. Refer to Air Conditioning Compressor Replacement (Service and Repair).
24. Install the A/C refrigerant filter. Refer to Air Conditioning Evaporator Thermal Expansion Valve Screen Replacement (Air Conditioning Evaporator Thermal Expansion Valve Screen Replacement).
25. Remove the TXV block fitting nut.
26. Disconnect the condenser tube and evaporator hose from the J45268-115.




27. Remove the TXV bolts retaining the J 45268-115.
28. Remove the J 45268-115.
29. Inspect the TXV for debris. Clean or replace as needed.
30. Install the TXV. Refer to Air Conditioning Evaporator Thermal Expansion Valve Replacement (Air Conditioning Evaporator Thermal Expansion Valve Replacement).
31. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging (Refrigerant Recovery and Recharging).
32. Leak test the fittings using J 42220 .

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