I blast the A/C the moment I step into the car because it burns up inside the car in the sun. I try and keep all the vents open all the way, but both driver's side vents won't stay open. They stay open for a few seconds, then pop half shut. It's really annyoing me, because I can't get the full blast of cold air on me for more than a few seconds at a time. Is there anything I can do about this?