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On the tensioner there is a little square hole on the frount of it, that is for your 3/8 socket ,but use a breaker bar insert it into hole and turn it and you will see belt come loose,, get diagram of how it winds back on at the parts store you got the belt at.
Any bearing mounted pulley can "freeze" if a bearing wears out. The most common result it it can burn up a belt which will break with the engine running. When it snaps it MIGHT damage anything it hits - usually with no bad results. ANY bad pulley (or pulley driven part such as the alternator) needs to be replaced before a new belt is installed or the new belt will be damaged from the friction. To replace the serpentine belt - there should be a belt routing decal on the underside of the hood or on the shroud covering the radiator.