A blower motor resistor is essentially a set of wire coils with fixed resistance values. Depending on your fan speed setting, current flows through one, two, or all of those coils before reaching the blower motor. • Low speed: Current flows through all resistor coils—maximum resistance, lowest current, slowest fan.
The truth is, a blower motor resistor keeps burning out not because of bad parts, but because something else in the circuit is overloading it. The resistor is part of the blower motor’s speed-control circuit. It works by adding resistance to the circuit to limit current flow.
It seems unlikely that both the control module as well as the fan stopped working at the same time. The blower control module may be using pulse width modulated (PWM) control to the blower - high speed digital switching of 12v power that may not be seen on any multimeter but seen as s 12 volts.
If the blower does not come up to speed immediately or acts erratically, then it''s likely a worn out motor. If you have another 12 volt motor, even a 12v lamp, you can wire it to the connections and see if either motor speed varies or lamp brightness changes. This would verify the control board is operating as designed.
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