An abnormal humming could be emitted from the alternator, water pump, the a/c pump, any number of things.
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
A bearing going bad.
Hummingbirds got their name from the humming sound their wings make as they beat rapidly in flight, which can sound like a hum. This noise is created by the rapid movement of the wings and is a key characteristic of these small birds.
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.
The York Air Conditioner that will not come on after it makes a humming sound then stops might have an issue with the electrical current going to the machine. It is possible that the fan is also the culprit. The fan has to come on before the air conditioner can operate properly.
seems to come from behind the surface
The sound would be reflected and seem to come from behind the reflective surface. This is commonly experienced near airports, where the sound of aircraft appears to come from the opposite direction, instead of from the airport.
If a person is in front of a smooth surface from which a sound is reflected, the person would hear a sound that ====================================================== Allow me to add(: SEEMS TO COME FROM BEHIND THE SURFACE:>
Take it to a dealer and have them check the cv joints. This could be a possibility on an older model car.
Hummingbird eggs...
The person would hear an echo or reflected sound. The time delay between the original sound and the reflected sound reaching the person's ears would be noticeable, along with some changes in the sound quality due to reflections off the smooth surface.
I know what your talking about, my brother and I can do it too. I don't know what it is but I just wanted to let you know that your not alone. I tried looking it up but only come up with people complaining of an annoying and constant humming. But like you my brother and I can turn it off and on at will for a limit of time. If you have any information that would would like to share just respond to this same message.