ventilation behavior changed

["Adam 16683" <acprice1@xxxx>]

This week I have noticed that when I start my car the ventilation 
flaps have to move back into position and there is a normal sounding 
vacuum hiss until the flaps are into position. I have had the mode 
switch in the Vent position for weeks and I am pretty sure the flaps 
remained in position while the car was off.

Is this the sign of a problem or is it normal and i just never 
noticed before? 

thanks
adam p
16683