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Don't know what it is, but I'm pretty sure I know the noise you're talking about...I hear it in my car as well. Seems to me that I tend to hear it more (maybe only?) on very warm to hot days.
I remember somebody asking about the same thing here, maybe a couple years ago. Somebody had an explanation, but I don't remember what it was. (I have no recommendations as to good 'key words' to do a search with.) I do remember that it was something innocuous, so I've ignored it for over 5 years now, with no unfortunate consequences (at least to this point).
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