A/C Service Tips and Precautions
Compressed air mixed with the HFO-1234yf (R-1234yf) forms a combustible vapor.
The vapor can burn or explode causing serious injury.
Never use compressed air to pressure test HFO-1234yf (R-1234yf) service equipment or vehicle air conditioning systems.
Air conditioning refrigerant or lubricant vapor can irritate your eyes, nose, or throat.
Be careful when connecting service equipment.
Do not breathe refrigerant or vapor.

The air conditioning system uses HFO-1234yf (R-1234yf) refrigerant and polyolester (POE) refrigerant oil.

Use only service equipment that is U.L.-listed and is certified to meet the requirements of SAE J639 to remove R-1234yf from the air conditioning system.

If accidental system discharge occurs, ventilate the work area before resuming service.

R-1234yf service equipment or vehicle air conditioning systems should not be pressure tested or leak tested with compressed air.

Additional health and safety information may be obtained from the refrigerant and lubricant manufacturers.

NOTE:
The following label is found under the hood.
The following illustration is an example. The value and the oil type of the actual vehicle may vary depending on the model.
Symbol
Symbol name
Caution
Inflammable refrigerant
Requires properly trained technician to service mobile A/C systems
A/C system
Always disconnect the negative cable from the 12 volt battery whenever replacing air conditioning parts.
Keep moisture and dirt out of the system. When disconnecting any lines, plug or cap the fittings immediately; do not remove the caps or plugs until just before you reconnect each line.
Before connecting any hose or line, apply a few drops of refrigerant oil to the O-ring.
When tightening or loosening a fitting, use a second wrench to support the matching fitting.
When discharging the system, use an R-1234yf refrigerant A/C recover/recycle/recharge machine; do not release refrigerant into the atmosphere.
Servicing of an R-1234yf system should be done in well-ventilated work area.
To ensure proper and safe operation, the Society of Automotive Engineers (SAE J2845) recommends that the refrigerant system only be serviced by trained and certified technicians.
Never repair or replace the air conditioning evaporator (cooling coil) with one removed from a used or salvaged vehicle.
New replacement mobile air conditioning evaporator must be certified (and labeled) as meeting SAE Standard J2842.
Vented refrigerant is harmful to the environment.
To avoid refrigerant from venting, never replace the evaporator with one removed from a used or salvaged vehicle.
Refrigerant in your vehicle's air conditioning system is flammable and can be ignited during servicing if proper procedures are not followed.
Requires a qualified technician to service.
For safety system components should be replaced shall not be repaired or salvaged for reuse.