It could be anyone of your accessories like you ac compressor, water pump, alternator, power steering pump or any of the idle pulleys. All have bearings that go bad over time. You can check them by removing the belts and turning the accessory ensuring that they are smooth to turn and do not feel rough. Anyone that doesn't feel smooth, replace. As for the ac just disconnect its belt and drive the car and see if the noise goes away. If it does then it will be the compressor clutch or the idler pulley bearing. Hope this helps.
Tuesday, December 26th, 2006 AT 6:19 AM