Flushing

Flushing


Tools Required
* J 41447 Leak Detection Dye
* J 42220 Universal 12V Leak Detection Lamp
* J 43600 ACR 2000 Air Conditioning Service Center
* J 45268 Flush Adapter Kit



Important: Flushing with the J 43600 is not intended to remove metal from the A/C system.



Flushing is intended to remove the following contaminants:

* Contaminated polyalkylene glycol (PAG) oil
* Desiccant, following a desiccant bag failure
* Overcharge of PAG oil
* Refrigerant contamination




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 (Refrigerant Recovery and Recharging) .
2. Remove the TXV. Refer to Thermal Expansion Valve Replacement (Service and Repair) .
3. Install the J 45268-113.
4. Remove the A/C compressor. Refer to Air Conditioning Compressor Replacement (Service and Repair) .
5. Install the J 45268-4 to the suction hose.
6. Install the J 45268-5 to the discharge hose.




7. Forward flow refrigerant flushing is recommended for contaminated refrigerant or PAG oil.
Perform the following procedure:


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


1. Service the filter with ACDelco P/N GF 470, before each flush.
Connect J 45268-1 flush filter to the J 45268-4 flush adapter.
2. Connect the blue hose from J 43600 to J 45268-1 flush filter adapter.
3. Connect the red hose from J 43600 to J 45268-5.

8. 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 J 45268-1 is serviceable. Remove and discard the check valve from the filter.


1. Service the filter with ACDelco P/N GF 470, before each flush.
2. Connect J 45268-1 flush filter to the J 45268-5 flush adapter.
3. Connect the blue hose from J 43600 to J 45268-1 flush filter adapter.
4. Connect the red hose from J 43600 to the J 45268-4.


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


9. Flush the A/C system. Follow the instructions supplied with the J 43600 .
10. Remove the J 45268-5 from the discharge hose.
11. Remove the J 45268-4 from the suction hose.

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.


12. If the removed A/C compressor will be reinstalled, 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 A/C compressor. Refer to Refrigerant System Capacities ([1][2]Capacity Specifications) .

13. If the A/C compressor will be replaced after flushing the system, refer to Compressor Oil Balancing (Service and Repair) .

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


14. Add one bottle of J 41447 directly to the A/C compressor.
15. Install the A/C compressor. Refer to Air Conditioning Compressor Replacement (Service and Repair) .
16. Inspect the TXV for debris. Clean or replace as needed.
17. Install the TXV. Refer to Thermal Expansion Valve Replacement (Service and Repair) .
18. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging (Refrigerant Recovery and Recharging) .
19. Leak test the fittings using J 42220 .