When I turn on either the blower or the a/c and wish to get air flowing from the dash level vents, the system changes to the under dash vents all on its own after a minute or less. Push the dash vent button, and the same thing happens after a minute or so.
welcome to priuschat! never heard of such a thing. i don't know if it's a glitch, or dealer programmable. see if it's covered in the 100 or so pages regarding ventilation in the manual. if not, a call to the dealer might be in order. mine stays where i put it, but the inside/outside air control seems to have a mind of it's own. all the best!
