What are the causes of a brand new serpentine belt squealing only on start up?

2008 HYUNDAI ELANTRA
73,500 MILES
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BAABBOTT
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I just replaced my serpentine and AC belts. Now, the serpentine belt squeals for about 5-7 seconds on start up only (not everytime though). Is this cause for concern? Will the belt "self-tighten"? I know its not the AC belt as it does not squeal during AC use. I will gladly take any suggestions. It has been about 2 weeks since the belts were changed.

Thank you.
Sep 20, 2011 at 10:15 PM
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MHPAUTOS
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Either the belt is a size to large or the automatic tensioner is weak and not tensioning the belt correctly, as it slips it heats up and grips better, i would look at these first.
Sep 20, 2011 at 10:30 PM
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BAABBOTT
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I did have the place look at it and the belt is really tight....the old belt did not squeal so I would think that the new belt creates much more tension that the tensioner may not be able to hold. What that be a correct assessment? thanks.
Sep 20, 2011 at 11:25 PM
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MHPAUTOS
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Clean all the pulleys especially if some form of belt grip used, this can cause slipping, basically one pulley will not be gripping, but normally it will be a worn belt or faulty tensioner, but as you have said these are ok. so look at the pulleys for contamination.
Sep 21, 2011 at 2:39 AM