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Anytime I've ever heard a humming noise when turning the steering wheel on any vehicle,It has always been due to low power steering fluid
as far as the humming noise and the grinding noise it sounds like your power steering pump is either out of fluid or gone bad completely. as for the muffler? ?MAYBE? the strain from the bad power steering pump is overworking the engine causing it to make noise? answer definetly a bad steering pump as for muffler, the sound can be transfred and magnified on a car, replace steering pump before bothering about the muffler sound may be gone
sounds like a wheel bearing.
A hummingbird
Check your power steering fluid
Check and see if your power steering fluid level is low.
when the pump is going out it will make a humming noise from the bearings even if the resivore is full.
it could be your tires on the pavement.
It's the power steering pump. Check the fluid level. You might have to replace the pump.
id say type and size of tire, and if bearings are bad either or will make that humming sound.
you need a noise filter! go to your local stereo shop and tell em you need a noise filter.
I have heard that if you have papers or napkins in the glove compartment box they can get sucked into the air vent which then makes a humming noise that you can hear while driving and as you increase the speed the pitch of the noise gets louder.