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I have noticed the same on my car from day one. Like you said, only on cold start. even if my car sits at work 9 hours it won't do it, but a full overnight cold start it does it. i too think it sounds like a pully or belt, but it happens for such a short timeframe under just these circumstances, i don't know, it must be something else, but what? its minor, yes...but i would like to fix it if i can without a trip to my dealership.
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