Hissing from dash area
I have a 2014 Kia Cadenza that I have noticed a hissing
noise coming from the dash for a couple months now. I
tried to use my AC for cold air on a warm day and noticed
that wasn't working. I turned the AC off and the hissing
stopped. Turned it back on and the hissing started
again...etc etc. So anyways, I guess there must be a
vacuum leak behind the dash that is not activating the AC
compressor and is not letting the car get cold. Anybody
have any insight on this on how to fix it? I just went over the
warranty at 71,000 miles....so I'd rather not pay the
ridiculous cost if it winds up being simple.