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Re: Humming from engine
I would try to pinpoint where the sound is coming from. It could be the belt needs replaced, idler pully, tensioner pully, alternator, power steering pump(check level), water pump, or a/c clutch.
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NO 4 N JUNK 
1994 GMC K1500 XC 5.7L
2008 Chevy Impala LTZ
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