Repair Instructions: Flushing: Flushing

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 .
3. Connect the A/C lines with the orifice tube removed.
4. Remove the A/C compressor. Refer to Compressor Replacement .
5. Install J 45268-5 to the A/C discharge hose.
6. Install J 45268-4 to the A/C suction 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 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 J 45268-1 flush filter to the suction port of J 45268  -4 flush adapter. See Special Tools .

   2. Install the blue hose from J 43600  to J 45268-1 flush filter adapter. See Special Tools .
   3. Install the red hose from J 43600  to J 45268-5. See Special Tools .
8. 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 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 45268-5 flush adapter.

   2. Install the blue hose from J 43600  to J 45268-1 flush filter adapter. See Special Tools .
   3. Install the red hose from J 43600  to the suction port of J 45268-4. See Special Tools .
IMPORTANT: Close the valve on the external refrigerant tank, before starting the flush process.
9. Flush the A/C system. Follow the instructions supplied with the J 43600  . See Special Tools .
10. Remove J 45268-4 from the A/C suction hose.
11. Remove J 45268-5 from the A/C discharge hose.
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.
12. Drain the PAG oil from the A/C Compressor. Rotate the compressor input shaft to assist in draining the PAG oil from the compressor.
13. Add back the total system capacity of PAG oil to the A/C compressor. Refer to Refrigerant System Capacities .
IMPORTANT: Flushing will remove the fluorescent leak detection dye from the A/C system.
14. Add one bottle of J 41447  directly to the A/C compressor. See Special Tools .
15. Install the A/C compressor. Refer to Compressor Replacement .
16. Inspect the orifice tube for debris. Clean or replace as needed.
17. Install the orifice tube. Refer to Expansion (Orifice) Tube Replacement .
18. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging .
19. Leak test the fittings using the J 42220  . See Special Tools .