To remove the fan you will use the hex key on the outer four screws that attach the fan to the fan clutch. You will have to keep the clutch from turning while you do this. There is a special tool for this, but it is nothing more than a bent piece of rod about 1/4" in diameter. There is a slot that you fit the rod into on the engine behind the fan, then it locks into one of the reliefs on the fan clutch to keep it from turning while you loosen those bolts. It's very difficult to describe with words.

Good luck,