Az Auto Air has been servicing vehicles with 1234yf since early 2014 when the new refrigerant came out. R1234yf was created as a more environmentally friendly replacement to R134a. The biggest difference between the two, is that R1234yf is mildly flammable and does require special handling. Diagnostic of the new refrigerant takes very specific equipment and training to service the new refrigerant. Az Auto Air has been repairing these systems for many repair shops in the valley for over 5 years. Your 1234yf experts are waiting to help you.