General Information

R-1234yf (HFO-1234yf) - 2, 3, 3, 3 - Tetrafluoroprop-1-ene (CF3CFCH2), is an olefin containing hydrogen, fluorine and carbon with thermodynamic properties similar to R-134a. This refrigerant is a mildly flammable gas. It has a boiling point of -29.2°C, a vapor pressure of 583 kPa absolute at 20°C, no ozone depletion potential, and a global warming potential (GWP) of 4.

In certain regions, technicians repairing or servicing motor vehicle air conditioning (MVAC) systems must be trained and certified by the appropriate regional or national regulatory agency.

• In the USA, refer to the EPA website for MVAC training requirements. http://www.epa.gov/ozone/title6/609/technicians/609certs.html
• In Canada, refer to the Environment Canada website for MVAC training requirements. http://www.ec.gc.ca/ozone/default.asp?lang=En&n=943E1CAB-1#ws4E6F6835
• In Europe, refer to Commission Regulation (EC) No 307/2008 for MVAC training requirements. http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2008:092:0025:0027:EN:PDF

Flushing is intended to remove the following contaminants:

• Contaminated air conditioning oil
• Desiccant, following a desiccant bag failure
• Overcharge of air conditioning oil
• Refrigerant contamination

NOTE:

Warmer engine or ambient temperature decreases the refrigerant recovery time during the air conditioning flush procedure.

1. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging (R-1234yf) 
2. Remove the front air conditioning evaporator thermal expansion valve. Refer to Air Conditioning Evaporator Thermal Expansion Valve Replacement 
3. Install the J 45268-151 in place of the thermal expansion valve.
4. Remove the air conditioning compressor. Refer to Air Conditioning Compressor Replacement (LGX) Air Conditioning Compressor Replacement (LCV) 
5. Install J 45268-10 to the discharge hose.
6. Install J 45268-10 to the suction hose.
Fig 1: A/C Filter And Check Valve
Courtesy of GENERAL MOTORS COMPANY
NOTE:

Forward flow refrigerant flushing is recommended for contaminated refrigerant or air conditioning oil.

NOTE:

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

7. Service the filter with ACDelco P/N GF 470, before each flush.
   1. Connect J 45268-1 to the suction port of J 45268-10.
   2. Connect the blue hose from GE-50300 Air Conditioning Service Center for HFO1234-yf to the J 45268-1 flush filter adapter.
   3. Connect the red hose from GE-50300 Air Conditioning Service Center for HFO1234-yf to the J 45268-10 flush adapter.
NOTE:

Reverse flow refrigerant flushing is recommended for desiccant cartridge failure.

NOTE:

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

8. Service the filter with ACDelco P/N GF 470, before each flush.
   1. Connect J 45268-1 to the discharge port of J 45268-10.
   2. Connect the blue hose from GE-50300 Air Conditioning Service Center for HFO1234-yf to the suction port of J 45268-1 flush adapter.
   3. Connect the red hose from GE-50300 Air Conditioning Service Center for HFO1234-yf to the suction port of J 45268-10 flush adapter.
NOTE:

The valve on the external refrigerant tank must be closed before starting the flush process.

9. Flush the front air conditioning system by following the instructions supplied with the GE-50300 Air Conditioning Service Center for HFO1234-yf.
NOTE:

If the vehicle is equipped with an auxiliary air conditioning system, it will be necessary to flush the front air conditioning system before flushing the auxiliary air conditioning system.

10. Service the filter with ACDelco P/N GF 470 before each flush.
    1. Remove J 45268-115 from the front evaporator.
    2. Inspect the front air conditioning evaporator thermal expansion valve for debris. Clean or replace as needed
    3. Install the front air conditioning evaporator thermal expansion valve. Refer to Air Conditioning Evaporator Thermal Expansion Valve Replacement 
    4. Install J 45268-115 in place of the auxiliary air conditioning evaporator thermal expansion valve.
11. Flush the auxiliary air conditioning system by following the instructions supplied with the GE-50300 Air Conditioning Service Center for HFO1234-yf.
12. Remove J 45268-10 from the discharge hose.
13. Remove J 45268-10 from the suction hose.
NOTE:

Flushing will remove all the air conditioning oil from the air conditioning system. The air conditioning system must be replenished with the correct amount of air conditioning oil.

14. If the removed air conditioning compressor is being reinstalled, perform the following procedure:
    NOTE:

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

    1. Drain the air conditioning oil from the air conditioning compressor.
    CAUTION:

    Refer to Correct Refrigerant Lubricant Caution .

    2. Add the total system capacity of air conditioning oil to the air conditioning compressor. Refer to Approximate Fluid Capacities 
15. Refill the air conditioning system with the proper amount of air conditioning oil. Refer to Approximate Fluid Capacities 
16. If the removed air conditioning compressor is being reinstalled, perform the following procedure:
    1. Drain the air conditioning oil from the air conditioning compressor.
    CAUTION:

    Refer to Correct Refrigerant Lubricant Caution .

    2. Add the total system capacity of air conditioning oil to the air conditioning compressor. Refer to Approximate Fluid Capacities 
17. If you will replace the air conditioning compressor after flushing the system, perform the following procedure:
    1. DO NOT drain the new air conditioning oil from the compressor.
    2. Deduct the amount of air conditioning oil shipped with the service compressor from the amount of air conditioning oil listed in the approximate fluid capacities table. Refer to Approximate Fluid Capacities 
CAUTION:

Refer to Correct Refrigerant Lubricant Caution .

18. Add the calculated amount to the compressor, as needed.
NOTE:

GE-41447-a leak detection dye is for PAG oil only.

19. Add one bottle of GE-41447-a leak detection dye directly to the air conditioning compressor.
20. Install the air conditioning compressor. Refer to Air Conditioning Compressor Replacement (LGX) Air Conditioning Compressor Replacement (LCV) 
21. Replace the air conditioning receiver and dehydrator. Refer to Receiver and Dehydrator Replacement 
22. Remove J 45268-115.
23. Install the auxiliary air conditioning evaporator thermal expansion valve. Refer to Air Conditioning Evaporator Thermal Expansion Valve Replacement 
24. Evacuate and recharge the air conditioning system. Refer to Refrigerant Recovery and Recharging (R-1234yf) .
25. Leak test the fittings using GE-50078  Electronic Leak Detector.