How do you change fan belt on Peugeot 206?

To change the fan belt on a Peugeot 206, first ensure the engine is off and cool. Remove the plastic cover if present, then loosen the tensioner pulley using a socket wrench to relieve tension on the belt. Slide the old belt off the pulleys and replace it with the new one, following the correct routing diagram (usually found in the engine bay). Finally, reapply tension to the new belt using the tensioner and reassemble any removed components.