Without a lil more information it's going to be really difficult to determine what maybe the issue here. Could be something as simple as the glovebox lid not being properly aligned to something caught in the A/C fan. I would start by tryin to isolate the noise and pinpoint the cause. You may have to have someone drive the car while you're over in the passenger seat givin a listen in.
Good luck !

Just my Dos Centavos