A/C only blows out the defroster. Any ideas on where to find this problem??? I have the dash apart in different areas and cant seem to find the problem........

Any ideas???

 

You have a failed vacuum input somewhere.

Most often this is attributed to the heretofore unseen vacuum reservoir or one of its plumbing lines developing a leak.

Here's just one thread that probably incorporates almost everything needed to diagnose and fix this problem. It can be as simple as one line out of place or something more labor intensive but there are many work-arounds. https://www.ford-trucks.com/forums/1...efrosters.html

Let me know if you need something more specific but read that thread and the side threads as well first.