How do I know if my AC blower motor is bad?Be aware of the following signs and symptoms of a bad AC fan motor.. AC Fan Doesn't Start. Even though you have the AC turned on, the fan does not start.. AC Fan Doesn't Stop. ... . Slow Rotating Blades. ... . Outside Fan Blades Are Still. ... . Rattling, Humming, and Buzzing Noises. ... . AC Runs Intermittently. ... . No Cold Airflow.. What can cause a blower motor to stop working?In most cases, a blower motor resistor fails due to corrosion or overheating. Sometimes, the mechanical resistance to the motor rotation causes an excessive electric current that can overheat and prematurely damage the blower motor resistor.
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