One for the die-hard follower

I think Ive solved a ten year mystery of why our focuses air con both stick on and the engine fans whir all the time . The Dial which sends air to clear the windscreen also automatically turns the air con and the engine fan to assist De-misting when turned on to the setting sending all the air to the windscreen . I have it permanently in this position ,so hopefully this ten year annoyance can be now avoided by selecting a notch down from full on . Mmmmm i hope this works . Still with me ?