Re: a/c r-12 or r-134
No idea on the exact year. I DO know that it says what it uses under the hood. Even if it was changed over, it has to be placarded. The new ones use a bigger inlet and the older ones used to look like tire valves, just one was bigger. I swapped mine over and it is a '90, about a month ago. Only BAD thing about the new R134; it's a smaller molecule and therefore, can leak out of the system easier than the old stuff could. So, you might have to replace it more often, untill all the little seals fill in. I'd still get a pro to to the system right. There's more to it than just the freon. You can be full and still not get cool if it's not running right.