Originally Posted by Razorbacks
I've discovered that the dash a/c does much better than the dash heater. Even when just driving on chilly spring mornings I have to turn on the furnace to warm the coach up a bit while driving. My heater just doesn't seem to work quite so well.
AC comes out upper vents and heat out lower. Check to see if your lower vents are aligned correctly, not kinked, etc. Also check to see if you have unintended openings that need the foam fix this thread has been talking about.