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I have similar problem with my 1990 318i and found that the aux fan not working (if you connect power directly - it works) because the thermal switch circuitry is faulty. I have then bipassed the thermal siwitches and made it so that the fan should run when ac is on. It worked for some time but then the fan being faulty itself is drawing too much current and blowing the fuse.
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∙ 16y ago
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