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If you're changing the alternator, you can loosen it's bolts to gain some slack, but you'll need more.

This is done using the belt tensioner. It's a pulley looking thing in the belt path. On my '96, it's down and back from the alternator. It's surface is often very shiny and it has what looks like a nut on the front. If you put a wrench or socket on the nut, you can rotate the entire assembly away from the belt. That will let you get the belt on or off.

The Haynes manual has a pretty good illustration.

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Q: How do you loosen the slack on an alternator belt for a 97 Pontiac Sunfire?
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