How do I replace the fan and air condition belts on a RAV 4 Toyota 1999

Loosen off the tensioner pulley in order to loosen the belt. First, loosen the bolt in the center of the pulley in order for it to be able to move, then turn the long adjuster bolt off to the side of the pulley in the bracket, and then the position of the pulley will change, allowing you to loosen it enough to get the belt off. Kind of hard to explain, but look for the pulley that is all by itself that doesn't turn anything...that is the one that adjusts the belt.