It could be either of the two previous answers in addition to a whining alternator bearing. I had the same problem with my 1996 Crown Vic and a new alternator resolved the problem.
Ok so wheel bearing it eas for me he humming and niw when I press the gas it whistles? & what is that??
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A lose belt or and pulley.
SOURCE: 1998 Ford Mondeo GLX, loud humming sound, front driver side.
Most likely it's a wheel bearing going out.., If you turn to the right, or the left when driving the noise will change pitch. Been there done that.....
SOURCE: My 04 ford explorer is making a loud humming noise
wheel bearings are worn out on the front, i had the same problem in my 2004 ford explorer just recently.
SOURCE: Humming/droning noise, front driver side.
guess i should make this so you can rate the solution ... thanks
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