If you are having humming noises coming out of the front end of your car then you will need to take off the front bumper and examine and see what the problem may be. You should be able to fix the problem within hours and be able to put the bumper back on.
If you have a Humming noise under your hood. It could be a number of problems. It could be a belt driven core or a damage part inside you engine. Thus you must locate the problem by using a stethescope while the engine is running and listening for extact location.