Would the ignition switch really cause it? I'm not having any trouble with anything else that runs off it. Also, the doors inside are moving because when i go to change it from the middle vents to the upper or lower, it does change, but it seems to be only changing to the upper defrost vents. I don't want to sound like I'm arguing with your opinion, but I'm just not sure that it could be the problem, unless you know something that I dont about the way these systems work?