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			does it make the sound regardless of whether the car is in gear?  FYI, when my water pump went, it made no noise; it just started to leak.  still, though, i'd remove the panel behind the seats, start the car and listen.  it could be a water pump, alternator, power steering pump, ac compressor, idle pulley, etc.  it should be fairly apparent if it's one of these ancilliaries.
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