1998 Ford Mustang Q&A

1998 Ford Mustang Question: ac blows thru deforst

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 -
Answer 1
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 -