squealing when accelerating
noticed the other day when i was accelerating from a stop sign that my Excursion had a loud squealing sound. of course i assumed the belt and checked it when i got home. belt is fine. no cracks and not dry. it only does this when the fan clutch is locked so i am assuming its the accessory drive system. when the engine was running it seemed that the upper idler pulley was moving just a wee bit so i replaced it and the belt to be on the safe side and it is still there. would a water pump do that? its not leaking and i have no shaft play.