For about a month now I have not had any heat or any blowing air at all when I select either the floor setting or windshield/floor setting. Does anyone know what the cause may be, and how hard it would be to take apart the dash to look behind the heat controls? I called GM (in Canada) and was told it would cost $114 to look at. I would much rather figure out how to remove the dash and spend that money on parts. Hopefully someone can help me out. Thank you in advance.