At least it sounds like it's in the glovebox area, or behind the shelf above the glovebox, when I first turn on the fan/heat/AC, but only occasionally. It whistles / chirps for a couple of minutes and then goes away. Occasionally it will come back for a minute or two after a while, but usually once it goes away it stays away. Sometimes I'll turn the fan on a higher speed and it goes away faster. Anybody got a clue? It drives me crazy when it happens and I worry that something in there is breaking!