Re: WTF?!
The clutch fan should spin fairly easy when it's cool. It' should NOT spin very easily when everything is good and hot. (use caution if checking when it's hot the rad will burn the crap outta you.)
If your clutch fan was leaking fluid and it wasn't coming out of the water pump then that is most likely your culprit. Try searching for threads on here for grand cherokee clutch fan upgrade, it can help immensely in controlling overheating.