Low humming engine noise that increases and decreases with RPMs No dash warn ?

Hello, I'd be most interested in finding something in the accessory drive area of the engine that could be causing this noise. This can be a pulley, idler or tensioner; it could be an alternator or steering pump pulley. Maybe best to remove the belt and see if you still hear the noise? If you do, then it's not accessory drive related, but if it is -- then you know where to focus attention. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops