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check to see if the belt is cracked or hard. hard or cracked belts are prone to sqealing. also you can use a stethescope or screwdriver(the cheap way) to listen to the pulley itself. carefull not to get caught in the belt while doing this.

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Q: 1997 Cadillac STS is squealing should you replace the belt or the idler pulley and how?
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