Re: 2001 Ford Focus chirp or squeal?!
Just grab a bottle of water, open the hood, start the car (specially when it is cold)a and drop some water on the belt. If noise go away, then it is belt. Sometimes, even when you have new belt installed, its squeeks because of bad (loose) tensioner. Worse then this could be a bearing in any of the pulleys including alternator. To isolate this problem, I would suggest running the engine without belt and confirm if this noise is not generated from anywhere else.
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