It may be that the tension on the belt is to high. Usually about 1/2" is good. With serpentines you don't have much choice though. So as long as the tensioner is working properly, you can rule that out.
Has the idler wheel been replaced? It may also be that the belt needs time to stretch and break in. Sometimes belts just suqeal until they get warm. It is usually indicitave of a loose belt slipping across a pulley. You have so many new parts that are all breaking in I would give it some time as they will spin more freely once they have some miles on them.
Monday, May 7th, 2012 AT 9:31 PM