Here are a couple other possiblilities.
Bearings going bad in either the Idler Pulley or the Tensioner Pulley.
Here is how to determine.
With spray lube in hand and engine off locate the idler and tensioner pulleys. Spray the center bolt of ONE of the pulleys then start engine, if noise is gone for short period of time then replace pulley. If noise still present turn vehicle off and spray center bolt on other pulley and start vehicle, again if noise is gone for short period of time replace pulley.
It could also be a weak tensioner. Post engine size in liters and I will post markings for checking for weak tensioner. And belt diagram showing were the tensioner and idler pulleys are.
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Wednesday, February 2nd, 2011 AT 2:08 AM