first of all welcome to S12oc,
you english is a little hard to understand, but i think i get the idea, sounds like you have the fan belt squeeling, you need to tighten or replace it, to tighten it you need to losen the top bolt of the alternator/generator and pull it out a bit till the belt goes tight.
i hope you can understand this, if not i know a few on here can speak french and can relpy with a good translate.
let us know how you get on with it.
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