Tools Required

• J 43600  ACR 2000 Refrigerant Station
• J 45268  Flush Adapter Kit
• J 41447  Leak Detection Dye
• J 41459  Leak Detection Dye Injector
• J 42220  Universal 12V Leak Detection Lamp

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. Refer to Refrigerant Recovery and Recharging 
2. Remove the orifice tube. Refer to Expansion (Orifice) Tube Replacement .
3. Connect the A/C lines with the orifice tube removed.
4. Remove the A/C compressor. Refer to Compressor Replacement (L18)  or Compressor Replacement (LR4, LM7, and LQ4)  or Compressor Replacement (LB7) .
5. Install J 45268-3  to the A/C compressor hose assembly.
6. Forward flow refrigerant flushing is recommended for contaminated refrigerant or PAG oil.
   Fig 1: Removing Valve From Filter

   Courtesy of GENERAL MOTORS CORP.

   Perform the following procedure:

   IMPORTANT: The filter inside J 45268-1  is serviceable. Remove and discard the check valve from the fitter.
   1. 6.1. Service the filter with ACDelco P/N GF 470, before each flush.

      Connect J 45268-1  flush filter to the suction port of the J 45268-3  flush adapter.

   2. 6.2. Connect the blue hose from the J 43600  to J 45268-1  flush filter adapter.
   3. 6.3. Connect the red hose from the J 43600  to J 45268-3  .
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.
   1. 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 J 45268-3  flush adapter.

   2. 7.2. Connect the blue hose from J 43600  to J 45268-1  flush filter adapter.
   3. 7.3. Connect the red hose from J 43600  to the suction port of J 45268-3  .
   IMPORTANT: Close the valve on the external refrigerant tank, before starting the flush process.
8. Flush the A/C system. Follow the instructions supplied with the J 43600  .
9. Remove the J 45268-3  from the A/C compressor hose assembly.
   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.

10. If you will reinstall the removed A/C compressor, perform the following procedure:
    • Drain the PAG oil from the A/C compressor. Rotate the compressor input shaft to assist in draining the PAG oil from the compressor.
    • Add the total system capacity of PAG oil to the A/C compressor.
11. If you will replace the A/C compressor after flushing the system, perform the following procedure:
    1. 11.1. Determine if the new service compressor is shipped with PAG oil.
    2. 11.2. If the service compressor is shipped with PAG oil, DO NOT drain the new PAG oil from the compressor.
    3. 11.3. Deduct the amount of PAG oil shipped with the service compressor from the amount of PAG oil listed in the capacities table.
    4. 11.4. Add the calculated amount to the compressor, as needed.
12. Install the A/C compressor. Refer to Compressor Replacement (L18)  or Compressor Replacement (LR4, LM7, and LQ4)  or Compressor Replacement (LB7) .
13. Inspect the orifice tube for debris. Clean or replace as needed.
14. Install the orifice tube. Refer to Expansion (Orifice) Tube Replacement .
15. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging 
    IMPORTANT: Flushing will remove the fluorescent leak detection dye from the A/C system.
16. Add one bottle of J 41447  using the J 41459  .
17. Leak test the fittings using the J 42220.