How do you fit a fan belt for a Volvo S40 1999 Model?

To fit a fan belt on a 1999 Volvo S40, first, ensure the engine is off and cool. Release tension on the old belt by rotating the tensioner pulley counterclockwise, then remove the old belt. Route the new belt according to the belt diagram usually found on a sticker in the engine bay, ensuring it sits properly on all pulleys. Finally, reapply tension by rotating the tensioner back into position and check the belt alignment before starting the engine.