I am attempting this same job. The correct tool is a 32mm open spanner which I have recently purchased from Partco. I intend to try heating the nut with a small blowlamp. If this fails I will remove two of the pulley bolts and partly thread in two longer ones. I can then hold the pulley with a bar or strong screwdriver blade and hopefully remove the fan. You must be sure of the thread direction. According to the Haynes manual, on a 95 to 2000 tranny it is normal right hand. In other words move to the left to remove. If your tranny is not in this age range I do not know for sure what the thread will be but on my Escort Mk.2 based vehicle the fan thread is left hand and this came off easily with a small adjustable spanner! Good luck, and I will have another go at mine when/if the weather improves.
Tony L
January 2005