How do I remove the coolant fan from the water pump on my 97 silverado?

I am trying to replace my water pump and cannot get the fan off. The truck has a 5.7 vortec and is 4x4. So far I have:

Removed the upper fan shroud

and drained the coolant (what was left!)How do I remove the coolant fan from the water pump on my 97 silverado?see if there's a large nut behind fins on fanHow do I remove the coolant fan from the water pump on my 97 silverado?They are pressed on so you will have to get the proper tool to remove it. Auto Zone rents them.