Hey guys,
I've searched all over the internet for any help with this and have gotten nowhere. If someone could help me out that would be great.

I recently bought a mint condition 98 Century. There is a squeaky/vibration sound that comes from the drivers side dash... at least I THINK it is the dash. It starts when I go over about 40 mph and gets louder the faster I go. It isn't a huge deal but the car is so nice and quiet that I am really annoyed by this noise that seems to be right in front of my face.

Could it be something under the hood? In the dash where I can't get to it? Help me eliminate this annoyance!

Thanks guys.