Answers: Your resistor block's bad...they're not too expensive, and straightforward to replace. It will either be on the passenger side of the engine compartment, or adjectives the way lower than the dash on the passenger side.
you substandard to mention what year and make of vehicle but sour the top of my head i would right to be heard it is the fan switch. at hand is constant 12 volts to the switch with the switch on and it has a series of resistors to drop the voltage for the lower speeds
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