there nut between the fan clutch and fan thats what you need to loosen to remove the fan.
you need a big wrench or big cresent wrench and get it on there and hit the wrench with a hammer its a normal right hand thread so hit it towards the passager side of the truck. it will come off it may take a couple of hits though.this is how i got mine off.
hope that helps.
I felt pretty stupid when Iwent to the dealer to get it taken off and he put a screw driver through two of the bolts on the water pump pully and used a wrench to losen the fan.......they dont even have a tool to do that.......so try that.
or have them do it....I drove 40 miles with it loose enough for me to get when I go home.....just dont let it be to loose.....