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I have a slight squeak coming from my belts on initial start up. What's the best way to figure out what is squealing? The serpentine belt is brand-new.
 

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A long screw driver or piece of wood on each pulley.
 

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Do you have an ac belt, if so change it out too since they are inexpensive. And if you still have a mouse it will most likely be the tensioner
 

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Make sure the tensioner is not getting stuck
 
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