How do you change the fan belt VW transporter?

To change the fan belt on a VW Transporter, first ensure the engine is cool and disconnect the battery. Loosen the tensioner pulley by turning the adjustment bolt and remove the old fan belt from the pulleys. Place the new fan belt around the pulleys following the correct routing, then adjust the tensioner to achieve proper tension on the belt. Finally, reconnect the battery and start the engine to check for proper operation.