Repair Instructions: Flushing

Tools Required

• J 43600  ACR 2000 Air Conditioning Service Center
• J 45268  A/C Flushing Adapter Kit
• J 41447  Leak Detection Dye
• J 42220  R-134A A/C Tracer Dye - Box of 24

Flushing is intended to remove the following contaminants:

• 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 front thermal expansion valve (TXV). Refer to Air Conditioning Evaporator Thermal Expansion Valve Replacement .
3. Install the J 45268-121 in place of the TXV.
4. Remove the A/C compressor. Refer to Air Conditioning Compressor Replacement .
5. Install J 45268-5 to the discharge hose.
6. Install J 45268-4 to the suction hose.
Fig 1: View Of A/C Filter & Check Valve
Courtesy of GENERAL MOTORS COMPANY
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.
   2. Connect J 45268-1 to the suction port of J 45268-4.
   3. Connect the blue hose from J 43600  ACR 2000 air conditioning service center to J 45268-1 flush filter adapter.
   4. Connect the red hose from J 43600  ACR 2000 air conditioning service center to J 45268-5 flush adapter.
8. Reverse flow refrigerant flushing is recommended for desiccant failure. Replace the desiccant when the A/C flush is complete and perform the following procedure:
   IMPORTANT:

   The filter inside J 45268-1 is serviceable.

   1. Service the filter with ACDelco P/N GF 470 before each flush.
   2. Connect J 45268-1 to the discharge port of J 45268-5.
   3. Connect the blue hose from J 43600  ACR 2000 air conditioning service center to J 45268-1 flush filter adapter.
   4. Connect the red hose from J 43600  ACR 2000 air conditioning service center to the suction port of J 45268-4 flush adapter.
IMPORTANT:

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

9. Flush the front A/C system. Follow the instructions supplied with the J 43600  ACR 2000 air conditioning service center.
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.
    1. Remove J 45268-121 from the front evaporator.
    2. Inspect the front TXV for debris. Clean or replace as needed.
    3. Install the front TXV. Refer to Air Conditioning Evaporator Thermal Expansion Valve Replacement .
    4. Install J 45268-121 in place of the auxiliary TXV.
11. Flush the auxiliary A/C system. Follow the instructions supplied with J 43600  ACR 2000 air conditioning service center.
12. Remove J 45268-5 from the discharge hose.
13. Remove J 45268-4 from the suction 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.

14. If the removed A/C compressor is being reinstalled, perform the following procedure:
    1. Drain the PAG oil from the A/C compressor.

       Rotate the compressor input shaft to assist in draining the PAG oil from the compressor.

    2. Add the total system capacity of PAG oil to the A/C compressor. Refer to Approximate Fluid Capacities .
15. If you will replace the A/C compressor after flushing the system, perform the following procedure:
    1. A new service compressor is shipped with PAG oil. Refer to Approximate Fluid Capacities .
    2. If the service compressor is shipped with PAG oil, DO NOT drain the new PAG oil from the compressor.
    3. Deduct the amount of PAG oil shipped with the service compressor from the amount of PAG oil listed in the capacities table. Refer to Approximate Fluid Capacities .

       Add the calculated amount to the compressor, as needed.

IMPORTANT:

Flushing will remove the fluorescent leak detection dye from the A/C system.

16. Add one bottle of J 41447  leak detection dye directly to the A/C compressor.
17. Install the A/C compressor. Refer to Air Conditioning Compressor Replacement .
18. Remove J 45268-121.
19. Inspect the auxiliary TXV for debris. Clean or replace as needed.
20. Install the auxiliary TXV. Refer to Auxiliary Air Conditioning Evaporator Thermal Expansion Valve Replacement .
21. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging .
22. Leak test the fittings using J 42220  R-134A A/C Tracer Dye - Box of 24.