My daughter has a 97 Mustang. A few weeks ago it started doing
something weird. No matter what air contolrs are ON the only place air
comes out is thru the defroster ducts. Air conditioning, heat, vent;
doesn't matter. It's only coming thru the defroster. Any ideas? Im
not sure how these controls work; if it is electrical or mechanical.
It's a little tight under the dash to just start pulling stuff out
without knowing exactly where I'm going. My old '66 was a lot easier
to work on than this so any help someone might havbe would be
appreciated.

Thanks