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Remove the accessory belt temporarily. Start the engine and run for a few seconds with no belt in your 'confined space'.
If the noise is gone,suspect wrong spec belt/misaligned pulleys or worn pulley bearings.
It is easy to overlook misaligned pulleys. Just put a straight edge across adjacent pulleys and measure the gap.
To check for worn bearings,try to rock the pulley at 12/6 o'clock.
I had both problems.
You can 'hack'/test by spraying Belt Grip
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2001 Boxster S
Engineers muse
Last edited by Scnell Gelb; 12-07-2015 at 02:40 PM..
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