Flushing (Non-HP5)

Special Tools

• J 43600  ACR 2000 Air Conditioning Service Center. See Special Tools .
• J 45268  Flush Adapter Kit. See Special Tools .
• J 41447  R134A A/C Tracer Dye - Box of 24. See Special Tools .
• J 42220  Universal 12V Leak Detection Lamp

Flushing is intended to remove the following:

• Contaminated polyalkylene glycol (PAG) oil
• Desiccant, following a desiccant bag failure
• Overcharge of PAG oil
• Refrigerant contamination

NOTE: 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 (With HP5)  or Refrigerant Recovery and Recharging (Without HP5) .
2. Remove the thermal expansion valve (TXV). Refer to Air Conditioning Evaporator Thermal Expansion Valve Replacement .
3. Install the stud for the J 45268  kit onto the J 45268-115. See Special Tools .
4. Install the J 45268-115 in place of the TXV.
CAUTION: Refer to Fastener Caution .
5. Install the TXV mounting bolts and tighten to 7 N.m (62 lb in).
6. Connect the evaporator line to the J 45268-115.
7. Install the TXV block fitting nut and tighten to 27 N.m (20 lb ft).
8. Remove the A/C compressor. Refer to Air Conditioning Compressor Replacement (HP5)  or Air Conditioning Compressor Replacement (LY7)  or Air Conditioning Compressor Replacement (LZ4)  or Air Conditioning Compressor Replacement (LAT, LE5) .
9. Install J 45268-10 to the A/C compressor hose assembly.
10. Install the nut and bolt from the J 45268  kit to the J 45268-10 and compressor hose assembly. See Special Tools .

    Tighten the bolts to 27 N.m (20 lb ft).

11. Forward flow refrigerant flushing is recommended for contaminated refrigerant or PAG oil.

    Perform the following procedure:

    Fig 1: View Of A/C Filter And Check Valve
    Courtesy of GENERAL MOTORS CORP.
    NOTE: 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. Install the port plugs J 45268-9 onto the J 45268-10.
    3. Install the fitting J 45268-7 onto the J 45268-10.
    4. Install the fitting J 45268-8 onto the J 45268-10.
    5. Connect J 45268-1 flush filter to the suction port of J 45268-7 flush adapter.
    6. Connect the blue hose from the J 43600  to the J 45268-1 flush filter adapter. See Special Tools .
    7. Connect the red hose from the J 43600  to the J 45268-8 flush adapter. See Special Tools .
12. Reverse flow refrigerant flush is recommended for desiccant bag failure. Replace the receiver dehydrator when the A/C flush is complete and perform the following procedure:
    NOTE: 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. Install the port plugs J 45268-9 onto the J 45268-10.
    3. Install the fitting J 45268-7 onto the J 45268-10.
    4. Install the fitting J 45268-8 onto the J 45268-10.
    5. Connect J 45268-1 flush filter to the discharge port of J 45268-7 flush adapter.
    6. Connect the blue hose from J 43600  to the J 45268-1 flush filter adapter. See Special Tools .
    7. Connect the red hose from J 43600  to the J 45268-8 flush adapter. See Special Tools .
NOTE: Close the valve on the external refrigerant tank, before starting the flush process.
13. Flush the A/C system. Follow the instructions supplied with the J 43600  . See Special Tools .
14. Disconnect the red hose on the J 43600  from the J 45268-10. See Special Tools .
15. Disconnect the blue hose on the J 43600  from the J 45268-1. See Special Tools .
16. Remove J 45268-1 from the J 45268-10.
17. Remove the J 45268-10 from the A/C compressor hose assembly.
NOTE: 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.
18. If you will reinstall the removed A/C compressor, perform the following procedure:
    1. Remove the A/C compressor drain plug.
    2. Drain the PAG oil from the A/C compressor. Rotate the compressor input shaft to assist in draining the PAG oil from the compressor.
    CAUTION: Refer to Component Fastener Tightening Caution .
    3. Install the A/C compressor drain plug and tighten to 16 N.m (12 lb ft) .
    NOTE: Flushing will remove the fluorescent leak detection dye from the A/C system.
    4. Add one bottle of J 41447  . See Special Tools .
    5. Add the total system capacity of PAG oil to the A/C compressor. Refer to Refrigerant System Capacities (With HP5) Refrigerant System Capacities (Without HP5)  .
19. If you will replace the A/C compressor after flushing the system, perform the following procedure:
    1. Determine if the new service compressor is shipped with PAG oil. Refer to the Refrigerant System Capacities (With HP5) Refrigerant System Capacities (Without HP5)  .
    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 Refrigerant System Capacities (With HP5) Refrigerant System Capacities (Without HP5)  .
    4. Add the calculated amount to the compressor, as needed.
    NOTE: Flushing will remove the fluorescent leak detection dye from the A/C system.
    5. Add one bottle of J 41447  . See Special Tools .
20. Install the A/C compressor. Refer to Air Conditioning Compressor Replacement (HP5)  or Air Conditioning Compressor Replacement (LY7)  or Air Conditioning Compressor Replacement (LZ4)  or Air Conditioning Compressor Replacement (LAT, LE5) .
21. Remove J 45268-115.
22. Inspect the TXV for debris. Clean or replace as needed.
23. Install the TXV. Refer to Air Conditioning Evaporator Thermal Expansion Valve Replacement .
24. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging (With HP5)  or Refrigerant Recovery and Recharging (Without HP5) .
25. Leak test the fittings using J 42220  .