Hi,
They can be a pain. For this vehicle (and many others), there are special tools designed to hold the water pump pulley in place while removing the fan. I attached a pic below showing what is indicated.
Oftentimes, a parts store will lend you a kit for replacing the fan clutch. Also, and don't laugh, what I do most of the time is place a wrench on the bolt holding the clutch to the pump. With the belt still installed, I take a heavy hammer and smack the wrench to shock and loosen the nut. It usually takes two or three hits, and it comes loose. Give it a try.
Let me know if this helps or if you have other questions.
Take care,
joe
see pic below.
Image (Click to make bigger)
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Tuesday, May 9th, 2023 AT 8:30 PM