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if you have the constant tension spring pulley, you use a 3/8" ratchet inserted into the square hole of the tensioner, then turn the ratchet counter-clockwise to loosen the belt tension and raise it off from one of the pulleys.
If this is a single belt system, see if there is a routing diagram sticker somewhere under the hood. If not, MAKE YOURSELF A DRAWING BEFORE YOU TAKE THE OLD ONE OFF.