Repair Instructions: Flushing

Tools Required

• J 41447  Leak Detection Dye
• J 42220  Universal 12V Leak Detection Lamp
• J 43600  Air Conditioning Service Center
• J 45268  Flush Adapter Kit

Flushing is intended to remove the following:

• Contaminated polyalkylene glycol (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 .
3. Connect the A/C lines with the orifice tube removed.
4. Remove the A/C compressor. Refer to Air Conditioning Compressor Replacement (4.3L) , Air Conditioning Compressor Replacement (4.8L, 5.3L, or 6.0L) , Air Conditioning Compressor Replacement (6.6L) .
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.
Fig 1: View Of A/C Filter & Check Valve
Courtesy of GENERAL MOTORS COMPANY
8. 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 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.

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

   IMPORTANT:

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

   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.

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

    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.

11. If the vehicle is equipped with rear A/C, flush the auxiliary A/C system separately.
Fig 2: Cutting Orifice Tube Frame & Screen
Courtesy of GENERAL MOTORS COMPANY
12. Cut the orifice tube frame and screen, enough to access the end of the orifice tube. Pinch off the orifice tube.
Fig 3: Pinching Off Orifice Tube
Courtesy of GENERAL MOTORS COMPANY