R-12 is in older cars now. R-12 is very, very, expensive if you can even find it. Most vehicles after 1995 have a different type but still you should inhales it. I used to work on car A/C many years ago. It sounds like the evaporator coil ruptured otherwise it should have vented outside the vehicle. But if the coil ruptured that is a different story.
Please let me know of any more info. Family was very sick from AC leak. Trying to document risks.