Quote:
Originally Posted by Drcoffee
Its only whistling for a few seconds, 5-10 seconds at the most. So narrowing it down is a challenge. I did listen by the alternator but its coming from higher up.
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Maybe you installed a supercharger and just forgot. hehe
The fact that it comes and goes tells me it's likely coming from the pulley system i.e. a bearing starting to go. A slight misalignment of the serpentine belt could also chirp or whine when it's cold. The alternator could be suspect as well. I've gone through a couple on my 4th gen. With your head under the hood any sporadic engine noise can sound omnidirectional which can make it difficult to pinpoint. Also, some solid state components can make a squealing noise under mechanical stress, although unlikely the source of your problem.