That noise you're hearing is most likely the wheel bearing. The noise stops because the bearing isn't in motion. As soon as you put the wheel in motion the noise returns due to the bearing being bad. It's a common problem across the board on most Audi's!
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
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.
Answer Humming noise from front endI just got my car fixed with the same problem and it was the wheel bearing and it is gone. Was it a fwd car?
Could be many things but a front wheel bearing/hub assembly going bad comes to mind. Scalloped worn tires can give you a humming noise also.
Check the wheel bearing.
Check the bearings.
it would most likely be the bearings but in some cases sometimes the axle make a humming noise when traveling at high speeds.(front wheel drive)
i would first balence the tires then try replacing the wheel bearings if the noise is coming from a specific area on the car In example left front, right front etc.
A computer tower may make a surging noise rather than a constant humming noise if the case's screws are not properly tightened. Another reason for such a surging noise is the imminent failure of a fan.
Worn passenger side front wheel bearings.
newdiv vacuum leak, cat. converter comming apart, exhaust noise
when the pump is going out it will make a humming noise from the bearings even if the resivore is full.