What's causing the whirring noise coming from my Saab 9-3's engine?

I have a funny whirring sound coming from my 2005 Saab 9-3 1.9 TDI's engine. Any ideas as to what it is?

Asked on 3 August 2010 by pauline34

Answered by Honest John
A bearing somewhere. Timing belt pulley, alternator, PAS pump, etc.
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