Started my car tonight after jumping it since battery went dead while sitting. It idled a good long time. It's getting very chilly here at night now & I wanted to defrost the windshield. Hit defrost button & plenty of hot air blowing from door vents, no air at all at base of windshield. I cycled thru the various air ducting settings & it blows, but not from base of windshield on any settings. Any ideas where to start & please tell me this doesn't involve removing the dashboard. I spent almost all day ripping out headliner & moonroof on my Subaru to replace defective caulk that lets lots of water in. I'm beat.