Flushing

Flushing

Tools Required
* J43600 ACR 2000 Air Conditioning Service Center
* J45268 A/C Flushing Adapter Kit
* J41447 Leak Detection Dye
* J42220 R-134A A/C Tracer Dye - Box of 24

Important: Flushing with the J43600 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.
2. Remove the front thermal expansion valve (TXV).
3. Install the J45268-121 in place of the TXV.
4. Remove the A/C compressor.
5. Install J45268-5 to the discharge hose.
6. Install J45268-4 to the suction hose.




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

Important: The filter inside J45268-1 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 J45268-1 to the suction port of J45268-4.
3. Connect the blue hose from J43600 to J45268-1 flush filter adapter.
4. Connect the red hose from J43600 to J45268-5 flush adapter.
8. Reverse flow refrigerant flushing is recommended for desiccant failure. Replace the desiccant when the A/C flush is complete and perform the following procedure:

Important: The filter inside J45268-1 is serviceable.

1. Service the filter with ACDelco P/N GF 470 before each flush.
2. Connect J45268-1 to the discharge port of J45268-5.
3. Connect the blue hose from J43600 to J45268-1 flush filter adapter.
4. Connect the red hose from J43600 to the suction port of J45268-4 flush adapter.

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

9. Flush the front A/C system. Follow the instructions supplied with the J43600.

Important: Flush the front A/C system before flushing the auxiliary A/C system.

10. If the vehicle is equipped with rear A/C, flush the auxiliary A/C system separately.
1. Remove J45268-121 from the front evaporator.
2. Inspect the front TXV for debris. Clean or replace as needed.
3. Install the front TXV.
4. Install J45268-121 in place of the auxiliary TXV.
11. Flush the auxiliary A/C system. Follow the instructions supplied with J43600.
12. Remove J45268-5 from the discharge hose.
13. Remove J45268-4 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.

14. If the removed A/C compressor is being 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.
15. If you will replace the A/C compressor after flushing the system, perform the following procedure:
1. A new service compressor is shipped with PAG oil. Refer to the Refrigerant System Capacities.
2. If the service compressor is shipped with PAG oil, DO NOT drain the new PAG oil from the compressor.
3. Deduct the amount of PAG oil shipped with the service compressor from the amount of PAG oil listed in the capacities table. Refer to Refrigerant System Capacities.
Add the calculated amount to the compressor, as needed.

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

16. Add one bottle of J41447 directly to the A/C compressor.
17. Install the A/C compressor.
19. Inspect the auxiliary TXV for debris. Clean or replace as needed.
20. Install the auxiliary TXV.
21. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging.
22. Leak test the fittings using J42220.