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OK, if you're familiar with transistors, a triac is similar. It allows a small amount voltage (controlled by the potentiometer) to control a larger voltage (your fan). Like transistors, there are different kinds with different ratings, so we'll need to know exactly what you've got and go from there.
Does your fan operate at all? If so, is it stuck at full speed?
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David Dryden
'86 911 Coupe
'05 BMW X5 4.4i
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