Repair Instructions: Flushing

Tools Required

• J 43600  ACR 2000 Air Conditioning Service Center. See Special Tools and Equipment .
• J 45268  Flush Adapter Kit. See Special Tools and Equipment .
• J 41447  Leak Detection Dye. See Special Tools and Equipment .
• J 42220  Universal 12V Leak Detection Lamp. See Special Tools and Equipment .

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. Refer to Expansion (Orifice) Tube Replacement (Body VIN Code 3) Expansion (Orifice) Tube Replacement (Body VIN Code 6) .
3. Connect the A/C lines with the orifice tube removed.
4. Remove the A/C compressor. Refer to Compressor Replacement (Body Type VIN 3) .
5. Install the J 45268-2 to the A/C compressor suction hose.
6. Install the J 45268-2 to the A/C compressor discharge hose.
Fig 1: View Of A/C Filter And Check Valve
Courtesy of GENERAL MOTORS CORP.
7. 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.
   1. Service the filter with AC Delco P/N GF 470, before each flush.

      Connect the J 45268-1 flush filter to the suction port of the J 45268-4 flush adapter.

   2. Connect the blue hose from the J 43600  to the J 45268-1 flush filter adapter. See Special Tools and Equipment .
   3. Connect the red hose from the J 43600  to the J 45268-5 flush adapter. See Special Tools and Equipment .
8. Reverse flow refrigerant flushing is recommended for desiccant bag failure.

   Perform the following procedure and replace the accumulator when the flush procedure is complete.

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

      Connect the J 45268-1 flush filter to the discharge port of the J 45268-5 flush adapter.

   2. Connect the blue hose from the J 43600  to the J 45268-1 flush filter adapter. See Special Tools and Equipment .
   3. Connect the red hose from the J 43600  to the suction port of the J 45268-4 flush adapter. See Special Tools and Equipment .
9. Flush the front A/C system. Follow the instructions supplied with the J 43600  . See Special Tools and Equipment .

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

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.
Fig 2: Orifice Tube Frame & Screen
Courtesy of GENERAL MOTORS CORP.
11. Cut the orifice tube frame and screen, enough to access the end of the orifice tube. Pinch off the orifice tube.
Fig 3: Orifice Tube
Courtesy of GENERAL MOTORS CORP.