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Blower motor resistors. Air on the side of caution. Hvac Blower Motor Resistor Blower Motor Resistor How It Works Symptoms Problems How To Replace A Blower Motor Resistor A Short Guide For A failed blower motor resistor can cause issues with the operation of the entire heating and air conditioning system. Signs blower motor resistor is bad . Does the noise change or increase when changing the fan speed. There are several symptoms that appear when the resistor of the blower motor is going bad. The most common symptom of a faulty blower motor resistor is a blower fan that only. If the heater blower motor burns out or short circuits it will not function and therefore will not be able to produce any airflow for the system. Usually a bad or failing blower motor resistor will produce a few symptoms. The blower motor will usually have to be replaced ...