2000 Dodge Durango

A couple days ago my Durango started making a loud squeaking noise. It does it at random times and I can't figure out exactly where it's coming from, but it's somewhere under the hood. I haven't tried to do anything yet because I'm not sure what to look for. Any ideas on what it might be and what to do would be great. It's getting really annoying, not to mention it's a little embarrassing.

October 20, 2007.

Does it do it louder if the car is in park and you turn the wheels? Try doing that wiht ac on does it get any louder? If it does you might have to replace the serp belt or tighten it.

Oct 20, 2007.