ok, winter is coming up, it was cold this morning so i turn the climate control to 90 leaving it on automatic. with this settings i realized that the a/c is not running so it fogs up my windshield, at the same time, it doesn't even get hot. I'm use to having the a/c running to compress the air to keep the humidity out and that still makes it blow hot air. but in this case, with the a/c on, it just gets cold like a regular ac still with climate control on 90. so whats up?? i noe the ac is not bad, is it just the heater? if so, is it something expensive to fix?