How do you replace fanbelt on a Vauxhall cavalier?

To replace the fan belt on a Vauxhall Cavalier, first, ensure the engine is off and cooled down. Locate the tensioner pulley and release tension on the belt by either turning the tensioner or loosening the mounting bolts. Remove the old belt and fit the new one, ensuring it aligns correctly with all pulleys. Finally, reapply tension to the belt and double-check the alignment before starting the engine.