Hmm, not sure if this helps or not, but I was getting a flapping noise that would come from under the passenger side dash when I turned off the A/C, heat or defroster. It could definitely be heard better when the car was not running and I guess the sound could have been described as rocks rolling in a plastic container/cylinder. It turned out to be the the fresh air recirculator servo was on its way out. My warranty replaced it. I have a 2001 with 37k on the odometer at the time.
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