So are you saying the bolt is seized and NOT moving at all? Get a bigger wrench or put an extension on the wrench for more leverage i.e. a pipe. Penetrating oil, like PB Blaster and let it soak in overnight, could help. Heat can help also, a plumbers torch to heat it up a bit, do NOT get the metal glowing, that causes damage to the surrounding area and the metal temper of the bolt itself. Already mentioned was the rap of a hammer, the shock sometimes breaks the threads free from the corrosion holding them together.
Keep in mind, dirt and containments in the tensioner can create noise, sometimes replacing it is the only cure for getting the dirt out. If oil reduces the noise, if its NOT washing the dirt out, then its only a temporary fix.
Also keep in mind, that other accessories can have problem that will cause a lot tension changes on the belt and move that tensioner back and forth a lot.
Late model alternators have a pulley with a clutch in it, to let the alternator overrun the belt drive, this greatly reduces the stress on the belt and other accessories. But this clutched pulley on the alternator often fails, making clicking noise and huge changes in belt tension. One test for a good clutch pulley on the alternator, have a helper rev the engine up to 3k rpm, while you watch the alternator, look inside the opening at the spinning armature inside. Have the helper shut off the motor as watch the spinning armature inside, after the motor and belt stops, you should still see the armature in the alternator spinning for a few more seconds. If the armature stops dead with the belt and motor, the clutch pulley is bad.
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