huming noise

when I start my car up it makes a loud huming noise it idles fine but the noise is really loud dont know what it is HELP

Do you have ABS? Mine made a humming sound at an idle until i disabled it.
Could also be A/C?

my ac never worked

make sure it isn’t coming from the distributor housing…the bearings have a tendency to go out on our cars. There was a recall on our cars but it ended in '99