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Where is the blower resistor located and what causes the fuse to blow on 1991 Chevrolet Blazer

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Every time I turn the blower fan on my heater/ac the fuse blows causing my speedometer to stop working because it is the same fuse 25A
(1) Answer
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The resistor is in the heater case under the hood next to the blower motor. Possible wiring issue or bad blower pulling to many amps causing the fuse to blow.
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