I have a 2001 Montana van, I am not getting hot air from the heater. The temp gauge shows cold. I had the van winterized. Could the temp gauge be a fuse? As far as the heat goes, a mechanic is trying to tell me it is a head gasket, but there is not water in my oil. The air is warm enough to defrost the windows, and you are not able to see your breath, but not warm enough to keep my feet from freezing.