How do you fit fan belt to a Peugeot 1.9 diesel?

To fit a fan belt to a Peugeot 1.9 diesel, first, ensure the engine is off and cool. Loosen the tensioner pulley, then remove the old belt by noting the routing path for the new one. Install the new belt according to the routing diagram, ensuring it sits properly on all pulleys. Finally, tighten the tensioner to apply the correct tension to the belt before checking it for proper alignment and operation.