Windscreen misting up and freezing inside

[LeRich]

Originally Posted by torque2me

Oh yeah! I have my a/c on all the time when misting starts. However, I don't like warm cabins on long runs as it can make one drowsy. So, a/c off until misting occurs then a/c on. No recirculation use ever!

You've found the use for the mystery wheel! The idea is the cabin is kept warm and comfy by the heating but the driver can direct fresh unheated air at face level through the upper vents to maintain alertness