While that's all good information, the original problem is an intermittent fan and "Manually pushing high on the fan does nothing". That last part eliminates temperature control completely and implicates the pushbutton unit. A flaky ignition switch would be another possibility.
If you've never taken your glovebox out and checked the foam hose, you should. It will probably disintegrate in your hand. Mine did.
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Mike Heath
1988 560SL Black/Palomino
1988 300SEL Black Pearl/Burgandy
1984 500SEC Anthracite Grey/Palomino
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