What is the difference? Awareness of Changing Refrigerant Types R134a & R1234yf

You may have noticed that A/C refrigerant on many new vehicles has started to change. For many years, Original Equipment Manufacturers (O.E.Ms) used R134a. However, government mandates require O.E.Ms to phase out R134a by the year 2021. This left O.E.Ms scrambling to find a replacement. Many US O.E.Ms chose to use R1234yf to replace R134a, but there are some O.E.Ms that have chosen a different route. Let’s take look at these new refrigerants.
R134a and R1234yf are similar, however, 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. Diagnosis of the air-conditioning system can be done in the same way as with R134a. However, you will need different recovery machines and other equipment to handle R1234yf. Some recovery machines are equipped for both R134a and R1234yf. These machines will be equipped with automatic refrigerant detection. To further help avoid confusion, ports for R1234yf systems are a different size. Unlike when R12 was changed to R134a, you cannot retrofit to use R1234yf.
The potential flammability of R1234yr has caused some European O.E.Ms to choose R744 instead. R744 is carbon dioxide, so it is non-flammable. In Europe, Mercedes-Benz is using R744 on the 2017 E-Class. Volkswagen Group stated the next generation Audi A8 will also be equipped with R744. This refrigerant uses very different A/C equipment because of the high pressure required, about 1400 PSI. This also causes safety concerns.
Make sure that you check for vehicle labels and O.E.M information to ensure the correct type of refrigerant is being used. Different refrigerants require different handling and storage precautions, oils, and A/C equipment. Make sure that you have the training needed to handle whichever refrigerant you are required to use.
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[@buddymorrissey]

Better for the environment? no, just better for DuPont's and Honeywell's profits since they hold the patents and 134 patents have expired.

[@claycoates5056]

Hay they want there money

[@jasoninpersonam3664]

So the y f stands for what???
Oh yeah, nevermind😂

[@KFLson]

I tried plugging R1234yf recharging kit on R134a port, it was leaking on the sides…is there a difference in sizes?

[@UrbanAutomotive01]

Absolutely there is a difference In sizes. That's done on purpose.

[@claycoates5056]

@@UrbanAutomotive01 in some apps