July 16, 201510 yr My heat and air all work wonderfully, however they will not blow on 4(high). In the last year the blower motor assembly has been replaced, as well as the blower resistor, and the system does not behave any different. I checked the plug to the blower motor and on all settings and there is 12 volts coming in, however, the plug is not grounding on the number 4 fan setting. Any help is appreciated. Cheers.
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