How do you change fan belts on 2001 Mazda millenia?

To change the fan belt on a 2001 Mazda Millenia, first ensure the engine is off and cool. Remove the engine cover if necessary, then locate the belt tensioner and use a wrench to relieve tension on the belt. Slide the old belt off the pulleys and replace it with the new one, ensuring it is properly seated on each pulley. Finally, reapply tension using the tensioner and check the alignment before reassembling any removed components.