My 300D did the same thing to me. First, check the fuse. it takes a red one. The fuses to the fans are notorious for blowing on these, and Performance sells an upgrade fuse holder just for the climate control fan for this reason. I now don't use the high fan setting and haven't had any problems since. If this doesn't fix it, you should be able to use the 95s unit. Be careful removing the wood though, it is delicate.

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Mr Goodfahrt (pronounced FAIRT... means "good trip" in German)

1982 300D Turbo Pastel Gray (off-white) 200k+(?)
newbie but willing