The only 2 positions where the fan doesn't come on are the dash vent and the floor/dash vent settings. A/c, floor/defrost and defrost all cause the rad fan to run. It could be a stuck relay, try pulling the 15 amp a/c fuse in the under dash fuse panel and see what happens. If that doesn't do it, try pulling the relay and test it with an ohm meter to see if the contacts are welded.
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