How do you change fan belt of 2000 Mercedes E200?

To change the fan belt on a 2000 Mercedes E200, first, ensure the engine is off and cool. Remove any necessary components for access, such as the engine cover. Locate the tensioner pulley and use a wrench to relieve tension on the belt, then remove the old belt. Install the new belt, ensuring it's properly routed according to the belt diagram, and then release the tensioner to tighten the belt.