I purchased an '06 Limited Roadster a few weeks ago. I have noticed that when I drive for maybe an hour or so, I hear an intermittent noise eliminating from the center dash area. The stereo was not on at the time so I wonder if it was something in the AC? The sound is an electronic "buzz" in the pattern of "badada badada badada." Anybody else heard this strange noise and figure out what is causing it? Thanks.

Guy