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It could be the IAC (idle air control) valve that is mounted on the throttle body. There was an update for these as some of them made a very loud whistling sound when they got a little older.
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Try to better describe the noise.
Is it a
scraping of metal
grinding / rubbing
high pitched shriek like a drive belt slipping
Is it
underneath the body
under the hood
in the aircon
when you pull into gear
when you pull away
etc
Do a bit of detective work and come back.
You could remove the serpentine belt and see if the noise continues, then check each component one at a time. You describe a slipping belt because the alternator pulls hard for the first few seconds after you start the engine.
Sounds like your serpentine belt is slipping try checking your belt tension with engine off if ok replace belt or purchse belt dressing spray at your local parts house.
Thhis noise could be a mutitude of issues. If you have some dash board spray, try spraying some on the top pully staying away from the fans and belts. Also position your face away from the expected spray. Water can be used but it not as affective. Then let me know what happened. Later DRRXR :)
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