Flushing
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 12 V Leak Detection Lamp
IMPORTANT: Flushing 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
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 orifice tube.
3. Connect the A/C lines with the orifice tube removed.
4. Remove the A/C compressor.
5. Install the J 45268-3 to the A/C compressor hose assembly for the Delphi compressor or install the J 45268-10 to the A/C compressor hose assembly for the Delphi CVC compressor.
6. Forward flow refrigerant flushing is recommended for contaminated refrigerant or PAG oil.
Perform the following procedure:
IMPORTANT: The filter inside the J 45268-1 is serviceable. Remove and discard the check valve from the filter.
6.1. 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 or the J 45268-10 flush adapter.
6.2. Connect the blue hose from the J 43600 to the J 45268-1 flush filter adapter.
6.3. Connect the red hose from the J 43600 to the J 45268-3 or the J 45268-10.
7. 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 the J 45268-1 is serviceable. Remove and discard the check valve from the filter.
7.1. 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 or the J 45268-10 flush adapter.
7.2. Connect the blue hose from the J 43600 to the J 45268-1 flush filter adapter.
7.3. Connect the red hose from the J 43600 to the suction port of the J 45268-3 or the J 45268-10.
8. Flush the A/C system. Follow the instructions supplied with the J 43600.
Close the valve on the external refrigerant tank, before starting the flush process.
9. Remove the J 45268-3 or the J 45268-10 from the A/C compressor hose assembly.
^ Remove the A/C compressor drain plug.
^ Drain the PAG oil from the A/C compressor.
Rotate the compressor input shaft to assist in draining the PAG oil from the compressor.
^ Install the A/C compressor drain plug.
Tighten
Tighten the drain plug to 20 N.m (15 lb ft).
10. Install the A/C compressor.
11. Inspect the orifice tube for debris. Clean or replace as needed.
12. Install the orifice tube.
13. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging.
IMPORTANT: Flushing will remove all the PAG oil from the A/C system.
NOTE: Do not mix refrigerant oils. Use of incorrect refrigerant oil will cause compressor failure.
The CVC compressor uses a low viscosity refrigerant oil, GM P/N 12378526 (Canadian 88900060).
14. Add the total system capacity of PAG oil to the A/C system. Refer to Refrigerant System Capacities (LA1) or Refrigerant System Capacities (L61).
IMPORTANT: Flushing will remove the fluorescent leak detection dye from the A/C system.
15. Add one bottle of J 41447 using the J 41459.
16. Leak test the fittings using the J 42220.
For a description of the RPO Code(s) shown in this article/image, refer to the RPO Code List found at Vehicle/Application ID. RPO Codes