Begin by starting engine, open hood and look at assy. Drive belts and pulleys. Look for any pulley wobbling or any discolored pulleys which would indicate bearing heat.
But from your description, it sounds like a pulley bearing.
If you see nothing, on a COLD engine, remove belts and start engine for 20 seconds. If noise goes away, then pulley, alt, waterpump, PS pump or possibly belt(s) are bad.
Saturday, January 23rd, 2010 AT 10:08 AM