How do you remove the fan clutch on a Chevy Silverado 2500HD Duramax?

To remove the fan clutch on a Chevy Silverado 2500HD Duramax, first, disconnect the negative battery cable and remove the fan shroud for better access. Use a special fan clutch tool to hold the water pump pulley in place, then turn the fan clutch counterclockwise to unscrew it from the water pump. Once removed, carefully lift the fan assembly out of the engine bay. Remember to replace any gaskets or seals when reinstalling the new fan clutch.