Air conditioning systems contain HFC-134a. This is a chemical mixture which requires special handling procedures to avoid personal injury.

Always wear safety goggles and protective gloves.
Always work in a well-ventilated area. Do not weld or steam clean on or near any vehicle-installed air conditioning lines or components.
If HFC-134a should come in contact with any part of the body, flush the exposed area with cold water and immediately seek medical help.
If it is necessary to transport or carry any container of HFC-134a in a vehicle, do not carry it in the passenger compartment.
If it is necessary to fill a small HFC-134a container from a large one, never fill the container completely. Space should always be allowed above the liquid for expansion.
HFC-134a and R-12 should never be mixed as their compositions are not the same.
HFC-134a PAG oil tends to absorb moisture more quickly than R-12 mineral oil and, therefore, should be handled more carefully.
Keep HFC-134a containers stored below 100°F (40°C).

Should HFC-134a contact your eye(s), consult a doctor immediately. Do not rub the affected eye(s). Instead, splash quantities of fresh cold water over the affected area to gradually raise the temperature of the refrigerant above the freezing point.

Obtain proper medical treatment as soon as possible. Should the HFC-134a touch the skin, the injury must be treated the same as skin which has been frostbitten or frozen.