Audi Repair Questions? Ask a Mechanic for Answers ASAP
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Most likely this is one of the pulley bearings or components that the drive belt operates.I have seen these fail before needing replaced.The best way I have found to locate the source of the noise is obtain a 3/4 inch rubber diameter hose about 2 feet long and place one end up to your ear and use the other end to probe around the engine pulleys with the engine running to see where the noise is the loudest at.Once you locate the pulley that is the loudest this is the component that needs replaced.I have done this several times before to locate noises like this here.You can obtain a rubber heater hose like this from a local hardware or parts store for fairly cheap.
I have seen alternator bearing failure as most common or the ac compressor in some cases.
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