The air temperature that comes out the vents is always 15-20 degrees warmer then the outside temp. even with the settings on 'low' and after my 1/2 hour drive to and from work. it seems it should purge out any hotter air by then. does the heater always pump out a little? when i had my A6, which at times had no heat i had this thermometer stuck in a vent to keep track of the temp. now the ar has plenty of heat but it seems like it should cut back when it is hot out.