Okay, first off, thanks to everyone who offered their advice-
to clarify- the vent blows air, but not cold air, and I do use r12, I
don't believe I needed to retrofit.
I took the car to a second mechanic, whom I trust, who told me that the
compressor is busted and needs to be replaced, which is fair enough, I
suppose. What bothers me though is that he said he needs to put freon
in again after he changes the compressor, because, since it was shot,
it was not circulating the freon, and the orginal mechanic effectively
filled it with air, that is, I still need freon, and I effectively
threw money away going to the first mechanic.
Does this stuff sound right to anyone out there? As I said, I'm not
very knowledgable about this subject.