I guess 20 years is long enough for auto a/c to keep working and now mine is about done in. The compressor is working (the lines run hot) but it's probably low on gas and I know better than to just refill it and hope for the best. Honda dealer says they'd need to keep the car for a few WEEKS to diagnose and fix it, and my regular mechanic won't tackle it.

So what are the most likely problems? Anyone have experience? I'm resigned to spending a bundle but at least the parts are all available.