Originally Posted by spike_africa

Number of things could be wring besides the belt, could be a idler pulley or tensioner. If it is the belt they sell whats called "belt dressing" and this would make it stop. You just take the can and spray belt while the car is running and it covers it in a light mist of sticky fluid. Another way is to take a crayon or candle (crayon works best) and run it on the belt while the car is running this covers it with a think coat of the wax and makes it not squeal. I would start with that and see if it fixes your problem as its super cheap to do either way.