Operation CHARM: Car repair manuals for everyone.
Home >> Buick >> 2008 >> Lucerne V8-4.6L >> Repair and Diagnosis >> Heating and Air Conditioning >> Service and Repair >> Flushing

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 (Non HP2) (Refrigerant Recovery and Recharging (Non HP2)).
2. Remove the TXV. Refer to Air Conditioning Evaporator 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 (L26/3.8L) (Service and Repair)Air Conditioning Compressor Replacement (LD8) (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 fromJ 43600 to J 45268-1 flush filter adapter.
3. Connect the red hose fromJ 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 fromJ 43600 to J 45268-1 flush filter adapter.
4. Connect the red hose fromJ 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 Air Conditioning 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 (L26/3.8L) (Service and Repair)Air Conditioning Compressor Replacement (LD8) (Service and Repair).
16. Inspect the TXV for debris. Clean or replace as needed.
17. Install the TXV. Refer to Air Conditioning Evaporator Thermal Expansion Valve Replacement (Service and Repair).
18. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging (Non HP2) (Refrigerant Recovery and Recharging (Non HP2)).
19. Leak test the fittings usingJ 42220.

pro multis · About Operation CHARM