Repair Instructions: Flushing

Tools Required

• J 41447  Leak Detection Dye. See Special Tools .
• J 42220  Universal 12V Leak Detection Lamp. See Special Tools .
• J 43600  ACR 2000 Refrigerant Station. See Special Tools .
• J 45268  Flush Adapter Kit. See Special Tools .

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 (LLY/LMM)  or Compressor Replacement (LU3)  or Compressor Replacement (LY2, LY5, LH6, L76, L92 and LMG) .
5. Install J 45268  -3 to the A/C compressor hose assembly. See Special Tools .
Fig 1: View Of A/C Filter & Check Valve
Courtesy of GENERAL MOTORS CORP.
6. 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. See Special Tools . 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 the J 45268  -3 flush adapter. See Special Tools .

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

   2. Connect the blue hose from J 43600  to J 45268  -1 flush filter adapter. See Special Tools .
   3. Connect the red hose from J 43600  to the suction port of J 45268  -3. See Special Tools .
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  . See Special Tools .
9. Remove the J 45268  -3 from the A/C compressor hose assembly. See Special Tools .
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. Drain the PAG oil from the A/C compressor. Rotate the compressor input shaft to assist in draining the PAG oil from the compressor.
11. 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.
12. Add one bottle of J 41447  directly to the A/C Compressor. See Special Tools .
13. Install the A/C compressor. Refer to Compressor Replacement (LLY/LMM)  or Compressor Replacement (LU3)  or Compressor Replacement (LY2, LY5, LH6, L76, L92 and LMG) .
14. Inspect the orifice tube for debris. Clean or replace as needed.
15. Install the orifice tube. Refer to Expansion (Orifice) Tube Replacement .
16. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging .
17. Leak test the fittings using the J 42220  . See Special Tools .