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wheel bearing
Unplug it.
The differintial is starting to wear...
check your wheel bearing
Most likely the humming noise is coming from a contactor located in the outdoor unit if you hear the noise outside or from the air handler or furnance located inside the home,if the hum is inside the home
possibly your running RCAs on the same side as your power cable
its probably your radiator
the humming noise is coming from a bad ground on you stereo
Certain types of tires may cause a brief humming noise after your initial acceleration. The transmission may also cause a brief humming noise.
Possible wheel bearing going bad.
Have you checked your transmission fluid? Try that Cindy
I believe it to be the airbag (passenger) making that humming sound