Yes.
Certain types of tires may cause a brief humming noise after your initial acceleration. The transmission may also cause a brief humming noise.
1999 Mercury front and humming noises can because by several things. Tire noises are the most common cause. A tire that is not wearing properly can cause a humming noise.
Bad wheel bearing
Possibly worn wheel bearings can create a humming or groaning sound.
A bearing going bad.
Cause it can't remember the words? Probably the regulator humming. Try adjusting burner control up or down. Replace the regulator if needed.
No
the bearings
Not an answer as such, but I'm wondering if it might do. We have a humming when the boiler isn't operating and when the Magnaclean unit is very hot to the touch.
The constant humming sound from the machine could be caused by a malfunctioning motor or fan, loose components, or an issue with the power supply.
Wheel bearing is on its way out.
The cruise control, since it affects the accelerator, can also cause a change in velocity.