I know this is an ancient thread, but I just wanted to share a bit if information after attempting this myself. The nut that holds the fan blades to the shaft is left handed threaded, but it is ALSO 20mm, at least on my car. I have never even seen a 20mm socket before, so if you plan on doing this job, you might want to have one on hand. I made due with a SAE wrench - 13/16 I think. You probably wont be able to get a wrench on there.
Thanks for the info on this. If anyone decides to try this and needs help, let me know. Essentially it all disassembles easily, though you need to drill out and replace 4 rivets to replace the bearing that is exposed to the weather. Theres a second bearing inside the housing that I did not try to get out, instead I cleaned it out with electronics cleaner and flooded it with spray lithium grease. Took 3 or 4 hours, although a large portion of that was spent replacing the cord since mine had been spliced. (You can desolder and reuse most of the electrical connectors on these cars, to make nice quality repairs or custom harnesses)
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