"The "chirping " noise is the cowl outside under the wipers, I fixed mine.
Just remove the wipers, remove the screws holding the cowl in under the hood, and the pull up on the cowl. Be careful though, because the washer lines are attached. You will then see how the cowl is attached to these clips. I put electrical tape on the cowl portion of the clips and pushed them back in.
No more sqeaking! Reverse assembly."
this wasn't written by me but it worked for my car. it may or may NOT work for you. some mustangs have a squeak that comes from behind the instrument cluster, that i have no idea how to fix.