About a year ago I kept hearing a screaching/chirping noise out of the front end of my Jeep while driving. One day while driving the check engine light started flashing. When I took it in to get fixed the shop said I had a seized belt. They said that would have also caused the chirping noise.
They didn't tell me which belt, I assumed it was the serpentine belt, but it may have been a fan belt.
After they fixed that, about a few weeks later the noise returned but the light stayed off. It eventually went away.
Fast forward to this winter. One day the sound just came back. It's been going on and off for about 2 months now. It is not constant/consistent. Sometimes I can drive somewhere without any noise, other times its there the entire time. It also does not have to do with pressing on the clutch or the gas pedal. While coasting down a hill it will still make noise.
I took it into a shop this past week and they heard it, but couldn't see anything visibly wrong with the jeep. It drives fine, just makes a chirping noise.
The noise is annoying, but clearly something is wrong somewhere because my Jeep is not supposed to make this noise.
Spray water on the belt if it goes away it shold be replaced or the tensioner replaced. It cold possibly be soemthing else though. But when a belt is replaced it is reccomended the tensioner be replaced as well. Also check all pulleys that belt rides on for a sharp edge it may have damaged the belt if it has one. That cold be anything in your accesory drive.