Larry N.
Well-known member
A lot of class A units have fans (for defrosting, perhaps no heat) that blow over the windshield -- under some conditions that big glass can frost up in a hurry. It's possible (but not certain) that that is what is meant.I thought that is what was posted, hence my assumption that it was running on the chassis battery. I am wondering if it is some sort of electrically heated element as most defrosting is a water heat exchanger.