If it's the same as my 1997 5.7, then you need a special wrench to fit the large, left handed thread nut that fastens it to the water pump. Most of these wrenches come as a set, with several sizes to fit Ford & Chevrolets, plus a fixture to hold the pulley still as you apply torque to the nut.
You can go out and buy a special fan clutch wrench set. Or just do it the shade tree way. Using a good heavy hammer and a long chiesel. position the chiesel on the fan clutch nut and smack the sucker. Make sure to leave the belt on and check to see if the clutch is left hand thread or not!
the fan clutch is attached with one large nut that is part of the clutch assembly .NOTE the the cluth has LEFT HAND thread.
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Remove the fan itself then remove the clutch from the fan
With a fan clutch removal tool from an auto parts store.
Unless the fan clutch is bad just remove it with the water pump. Otherwise it is a 36mm fan clutch wrench that most auto parts stores have for rent.
Lefty loosey, righty tighty.
you have to have fan clutch wrenches
clutch fan is removed with 2 special tools. these are available at auto stores.they are not cheap. also remember the clutch fan screws onto water pump, and has left hand thread,so you will need to turn it clockwise to remove
Remove the fan belt, by loosening the tensioner pulley. Remove the fan clutch with the retaining bolts. Reverse the process to install the new fan clutch.
how to remove the clutch fan on the 530i bmw
To remove the fan clutch on a Chevy Tahoe, the upper fan shroud must first be removed. Once removed, a tool is needed to hold the clutch in place to allow for the fan to be removed. The nuts must be unscrewed on the fan in a counterclockwise rotation. Remove the nuts on all side and the fan clutch will remove.
The fan itself rotates CCW. The clutch nut is standard right hand thread, lefty loosey, righty tighty.