The humming noise can be in your exhaust system. The exhaust will heat up and seal the area where there can be a leak. The hot exhaust will cause the noise to decrease.
radiator fan.
where is the humming noise coming from? if it's coming thru the speakers and matches the rev tone of the engine, then you have a bad ground in your stereo.
when the pump is going out it will make a humming noise from the bearings even if the resivore is full.
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.
wheelbearing or cv axle enjoy
sort of like a humming? wheel bearings dude! if it starts humming at about 30mph and just gets louder faster you go, its the wheel bearings. and get used to it, i have blown 4 on my ion 3
is the humming coming from the front end of the vehicle? i have a 1996 explorer with the same issue. yes the noise come from the front but not all the time seems to make the humming noise when it gets hot
If a car has a loud humming noise when accelerating, it could be that the air filter is missing. The air filter housing might also be loose. A loud humming noise can also be a signal that there is something wrong with the alternator belt or the fan belt.
have seen in the past , fuel pump moan/noise on this make & model / from a ford tech.
A hummingbird
wheel bearing