The motor which blows air through the vents.
The heater makes a humming sound.
When a fan is turned on, it typically makes a humming or whirring sound as the blades rotate and circulate air.
Possibly worn wheel bearings can create a humming or groaning sound.
A bearing going bad.
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.
the bearings
A humming bird
if it sounds like a loud humming sound, its most probably your wheel bearings. Cost from £20 to £60
No, but a bad wheel bearing could.
bad wheel bearings
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.