a humming noise is usually related to the fuel pump about to go. or u just have a really loud fuel pump and everything is fine.
sounds like a motor mount is broken or a transmition mount. have those checked.
If the heater blower has humming noise when motor is running, first check its capacitor. If the capacitor is fine, then the motor is the problem and may need to be replaced.
The guy in the trunk is still alive!!!
newdiv vacuum leak, cat. converter comming apart, exhaust noise
possibly your running RCAs on the same side as your power cable
humming noise is a bad ground to the radio. you may have a loose connection. connect a ground wire to frame of truck.
There can be a slight humming noise while driving a neon. This sound could come purely from the engine to indicate that it is running.
Your engine might make a humming noise near the alternator after you shut it down because the fan is still running or because the fuel pump is shutting down. Another cause for the humming noise could be the AC motor turning off.
radiator fans running to cool engine...
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.
Cant They are a sealed, non servicable unit. If they are making noise, they must be replaced, about $135 each