My air conditioner works pretty well, but when I try and increase the temperature to put the heat on a)a foggy gas of some sort comes out of the vents and fills up my car, b)it has a funny smell, and c)all of my windows fog up, especially the windshield, and the windshield defroster does absolutely nothing at any temperature. The only time when it works is when it rains (because my windshield ALWAYS fogs up when it rains). Note: even when it is cold outside and the heat is not on at all, the windshield still fogs up. Help??