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Flushing (Auxiliary System)



FLUSHING (AUXILIARY SYSTEM)

TOOLS REQUIRED
- J 43600 ACR 2000 Air Conditioning Service Center
- J 45268 Flush Adapter Kit
- J 41447 Leak Detection Dye
- J 41459 Leak Detection Dye Injector
- J 42220 Universal 12V Leak Detection Lamp

IMPORTANT: Flushing with the ACR 2000 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

1. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging.

IMPORTANT: Warmer engine or ambient temperature decreases the refrigerant recovery time during the A/C flush procedure.

2. Remove the orifice tube.
3. Connect the A/C lines with the orifice tube removed.
4. Remove the A/C compressor.
5. Inspect the end of the suction hose for a suction screen.
6. Remove the suction screen, if installed.
7. Install J 45268 -2 to the A/C compressor hose assembly.




8. Forward flow refrigerant flushing is recommended for contaminated refrigerant or PAG oil.Perform the following procedure:
1. Service the filter with ACDelco P/N GF 470, before each flush.Connect J 45268 -1 flush filter to the suction port of J 45268 -2 flush adapter.

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

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 -2 flush adapter.
9. Reverse flow refrigerant flushing is recommended for desiccant bag failure. Perform the following procedure and replace the accumulator when the flush procedure is complete.
1. Service the filter with ACDelco P/N GF 470, before each flush.

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

2. Connect J 45268 -1 flush filter to the discharge port of J 45268 -2 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 suction port of J 45268 -2 flush adapter.
10. Flush the front A/C system. Follow the instructions supplied with the J 43600.

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

11. If the vehicle is equipped with rear A/C, flush the auxiliary A/C system separately.

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




12. Cut the orifice tube frame and screen, enough to access the end of the orifice tube. Pinch off the orifice tube.




13. Install the pinched orifice tube.

IMPORTANT: Pinch off the orifice tube in order to prevent refrigerant flow to the front system during the auxiliary system flush.

14. Remove the auxiliary TXV.
15. Install J 45268 -108.
16. Install the auxiliary evaporator core to the A/C lines.

IMPORTANT: The auxiliary evaporator core can be flushed without totally reassembling into the auxiliary HVAC module.

17. Raise the vehicle. Refer to Vehicle Lifting.
18. Connect the auxiliary A/C lines to the auxiliary evaporator core.
19. Lower the vehicle.
20. Flush the auxiliary A/C system. Follow the instructions supplied with the J 43600.
21. Raise the vehicle. Refer to Vehicle Lifting.
22. Remove the auxiliary A/C lines from the auxiliary evaporator core.
23. Lower the vehicle.
24. Remove J 45268 -108.
25. Inspect the TXV for debris.Clean or replace as needed.
26. Install the auxiliary TXV.
27. Remove J 45268 -2 from the A/C compressor hose assembly.
28. If the removed A/C compressor is being reinstalled, 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. Install the A/C compressor drain plug.

Tighten the drain plug to 20 N.m (15 lb ft).

4. Add the total system capacity of PAG oil to the A/C compressor. Refer to Refrigerant System Capacities.

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.

29. If you replace the A/C compressor after flushing the system, perform the following procedure:
1. Determine if the 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.
4. Add the calculated amount to the compressor, as needed.
5. If the service compressor is shipped dry, no calculation is required. Add the total system capacity of PAG oil to the compressor. Refer to Refrigerant System Capacities.
30. Add one bottle of J 41447 directly to the A/C compressor.

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

31. Install the A/C compressor.
32. Install a new orifice tube.
33. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging.
34. Leak test the fittings using J 42220.
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