Remove switch and check it out with a meter. Clean and lube with proper contact cleaner, NOT WD-40. Short out the leads to see if the fan works. Fan motors can slow down, partially seize or seize altogether but usually respond to a good clean and some oil on the bushes. Check by running with leads directly from the battery and if removed clamp in a vice and give them a good run with full 12 volts. Good luck.
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