How do you fix the rotary pulley to a gmc 2000 montana van?

To fix the rotary pulley on a 2000 GMC Montana van, first ensure the engine is off and cool. Remove any necessary components, such as the serpentine belt, to access the pulley. Use a socket wrench to remove the bolts securing the pulley, then replace it with a new or repaired pulley, securing it tightly with the bolts. Finally, reassemble any components you removed and replace the serpentine belt if necessary.