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This article is from the VW Technical FAQ, by with numerous contributions by Jan Vandenbrande others.

18 I hear an intermittent high pitched chirping noise that comes and goes when I rev the engine?

A: This could be caused by a bunch of things.
First check whether all the belts are on tight enough, but also not too
tight (there is a difference between a belt slipping, e.g., when you go
through a puddle, and a bearing being over stressed).
Remove all belts, and if the noise persists, suspect the drive belt
tensioner. (You can actually feel it vibrate when it chirps, but don't get
your fingers stuck).
They are easy and cheap to replace, see elsewhere for a replacement
tensioning tool.
If that's not it, and the drive belt is not on too tight (see above) then
you may be in trouble.

 

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