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Message: <blockquote data-quote="DaveS" data-source="post: 2201011" data-attributes="member: 209143"><p>Several things could cause this. There is what is called a blend door in the dash of your car that diverts the air flow to whatever you have selected on the control unit on the dash. (defrost, floor, dash etc.) Older vehicles were cable controlled, while most vehicles now are vacuum controlled. By default, and for safety reasons, they are made to divert all of the air to defrost if anything malfunctions. You either have a faulty control unit, lack of vacuum to the unit or a stuck control door. Any of these are easily fixable, however control units can be somewhat pricey.</p></blockquote><p></p>