Pretty day 76 degrees out, windows down, radio off, climate off, traveling 20 mph in residential neighborhood and suddenly defrost blower comes on, loud. Climate not showing it was 'on' but tried turning it off, nothing happened. It blew for another 3 minutes and then just suddenly turned off. By suddenly I mean it turned off on its own. I suppose it sensed there was ice on my front windshield but irritating that I couldn't make it stop.