Been going over my 400 to find the little problems I'll list for my next warranty service. I recently noticed when my AC is set to recirculation but the system is not in use fresh air flows out of the dash vents at a rate reflected by driving speed. For me that means hot air blowing in the summer and cold in winter. My only solution for now is to switch to the lower vents which tells me there is some level of functionality in the dampers. Does the flap actuator only function while the fan is on or can I add this to my list? Would hate to hear the dealer say yet again, "that's normal"