There's nothing quite like having the right tools for the job, it takes a job that results in busted knuckles and broken bolts to one that goes simply, allowing you to move on with your life. Many service jobs on the Duramax require removal of the fan clutch. Without the right tool, removal can be difficult and damage to the nut can occur. This fan clutch wrench makes for simple removal and includes a pocket to accept an air hammer bit for added convenience.