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The serpentine belt tension in the Sunfires is self adjusting via the tensioner which is in the belt path. It's spring loaded against the belt. I guess the spring could be wearing out, but I rather doubt it on a car as new as yours.

The only other alternative I can think of would be that the Alternator has come loose, but that more or less implies that a couple of bolts have fallen out of it.

Why are you asking about the belt? Are you observing something abnormal?

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15y ago
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Q: How do you tighten the serpentine belt on a 2002 Pontiac Sunfire?
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