Air conditioning only comes out of defroster.
 

I have a 1988 Mustang with a problem. The A/C only comes out of the floor and the defroster. Does not come out the vents on the dash that can be moved. Can anyone give me some pointers as to where I should look. Is it electrical, vacuum or what? Thanks.

Probably a vaccuum leak in the A/C controls. Or the actual selector switch might be bad. The vacuum lines attach to the back of the selector switch and go to the different dampers etc.