Humming noise - engine compartment

[Ashmyster79]

I read another thread and said something about the belt. I will do what you suggested with the belt off and see if it makes a hum sound. I need to put the new belt on really.

Thanks for the reply

[kk2002s]

If it's at start up and goes away after a couple minutes - Secondary Air Pump
If it happens after engine is real warm then it could be the Engine compartment fan that helps circulate air
These both are fan like sounds

If its constant then I +1 on a drive component off of the belt