Odds are the "growling" noise is a bearing on a pulley going out. Could be anything from altenator, steering pump, water pump, but most likely just an idler pulley. You need a mechanics stethascope to diagnose and then just need to replace the proper pulley.
There is a bad bearing in 1 of 4 locations power steering pump, water pump, alternator, or most likely the a.c. compressor. they all run off 1 serpentine belt. by the way it could be a damper pulley also making this noise. time to take it to a service garage before the bad bearing freezes up on you. and i mean quickly. if i read you right, over time!!
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