The motor which blows air through the vents.
The heater makes a humming sound.
Possibly worn wheel bearings can create a humming or groaning sound.
A bearing going bad.
the bearings
A humming bird
if it sounds like a loud humming sound, its most probably your wheel bearings. Cost from £20 to £60
bad wheel bearings
No, but a bad wheel bearing could.
You may need differential fluid...check that.
The caliper may be hanging and causing the humming sound. I cant type the sound out but it mine made a humming noise as the wheels turned. If I pressed the brakes hard and quickly let go it would stop. I just replaced rotors and brake pads and it is back to normal now.
There could be a few things that can cause this humming sound. It could be the wheel bearings rubbing, it could be the gears rubbing, it could even be coming from the engine pistons.?æ
The word is droning. It means to make a continuous low humming sound.