How do you tighten the fan belts on 2000 model land cruiser diesel wagon?

To tighten the fan belts on a 2000 model Land Cruiser diesel wagon, first, locate the tensioner pulley or the adjustment bolts on the alternator or other components driving the belt. Use a wrench to loosen the adjustment bolts slightly, then apply pressure to the alternator or component to increase belt tension. Once the desired tension is achieved, tighten the adjustment bolts securely. Finally, check the tension by pressing down on the belt; it should have a slight give but not be loose.