Don't mean to butt in, but Freon is a registered trade mark of r-12, like Xerox is to copiers. R-134 is known as "serva" or something like that, I don't recall at this second............Also a good thing to check if your a/c isn't working up to par at idle sitting in traffic is the fuse for the aux fans. If the 30 amp fuse is blown (and most likely is), there is a modified aux fan harness after replacing the fuse with a 40 amp.