help please? blowing aux fan fuse, any ideas?

Hi guys and happy new year to all, 94 XJ, auto ,4.0 HO, 4X4, is blowing my aux fan fuse pretty much every other day, the first one that I noticed was melted without blowing ,I replaced it and after that I notice that blows a fuse cause my temp gauge goes a bit above 210, any problem that anybody heard of ? thanks

german 996