ac blows thru deforst on 1998 Ford Mustang

my ac blows cold air but it only blows thru the defrost vent what is wrong with it and what do i do to fix it

Asked by for the 1998 Ford Mustang
1 answer
check under the hood by the driver door and make sure the small vacum hose is hooked up and not broke cause my buddy has a 97 and that is what was wrong with it