Flushing

FLUSHING

TOOLS REQUIRED
- J 43600 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:
- Contaminated PAG oil
- Desiccant, following a desiccant bag failure
- Overcharge of PAG oil
- Refrigerant contamination

1. Recover the refrigerant.

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 the J 45268-3 to the A/C compressor hose assembly.




8. Forward flow refrigerant flushing is recommended for contaminated refrigerant or PAG oil.Perform the following procedure:
8.1. Service the filter with ACDelco P/N GF 470, before each flush.Connect the J 45268-1 flush filter to the suction port of the J 45268-3 flush adapter.

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

8.2. Connect the blue hose from the J 43600 to the J 45268-1 flush filter adapter.
8.3. Connect the red hose from the J 43600 to the J 45268-3 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.
9.1. Service the filter with ACDelco P/N GF 470, before each flush.Connect the J 45268-1 flush filter to the discharge port of the J 45268-3 flush adapter.

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

9.2. Connect the blue hose from the J 43600 to the J 45268-1 flush filter adapter.
9.3. Connect the red hose from the J 43600 to the suction port of the J 45268-3 flush adapter.
10. Flush the front A/C system. Follow the instructions supplied with the J 43600.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 the J 45268-104.
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 the J 45268-104.
25. Inspect the TXV for debris.Clean or replace as needed.
26. Install the auxiliary TXV.
27. Remove the J 45268-3 from the A/C compressor hose assembly.

NOTE: Refer to Fastener Notice in Service Precautions.

28. If the suction hose had a suction screen before flushing, replace the screen.
- Remove the A/C compressor drain plug.
- Rotate the compressor input shaft to assist in draining the PAG oil from the A/C compressor.
- Install the A/C compressor drain plug.

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

29. If replacing the A/C compressor after flushing the system, perform the following:
- Determine if the new service compressor is shipped with PAG oil.
- If the service compressor is shipped with PAG oil, DO NOT drain the new PAG oil from the compressor.
- Deduct the amount of PAG oil shipped with the service compressor from the amount of PAG oil listed in the capacities table.Add the calculated amount to the compressor, as needed.
- If the service compressor is shipped dry, no calculation is required. Add the total system capacity of PAG oil to the compressor.
30. Install the A/C compressor.
31. Install a new orifice tube.
32. Evacuate and recharge the A/C system.
33. Add the total system capacity of PAG oil to the A/C system.

IMPORTANT: Flushing will remove all of the PAG oil from the A/C system.

34. Add one bottle of J 41447 using the J 41459.

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

35. Leak test the fittings using the J 42220.