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Q: Blower Motor works sometime on 2006 Chevrolet Colorado

My heater/AC fan will work all the time in high speed. All other speeds will not work sometimes. Have you an idea what’s wrong with this?
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BLOWER RESISTOR! High speed is not controlled by the resistor,but the lower speeds are.
Located near the blower motor behind glove box.
system electrical diagram and circuit description of operation......then you can guess all you want or diagnose it with the correct info & troubleshooting guide.
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