The change in resistance then limits the current through the motor, which dictates the speed at which the blower fan works. The fan control switch on your dashboard may be often overlooke but there is more than meets the eye going on behind your dashb. Blower motor resistor function and diagnostics, a wells tech blower do in car?
The heater blower resistor helps control the rate at which the blower motor supplies this air. But if the resistor burns out or wears out from corrosion, there is nothing to reduce the amount of voltage going to the blower motor for the lowest fan spee so it will .
There are two types of blower motor resistors.
One uses coils of wire in different thicknesses to produce the resistance.
It has one coil for each speed. The likely reason is because the resistor is failing. The resistor limits the voltage to the fan motor thus . I have power and ground to the motor blower. This increase in current as the resistor moves toward higher speeds increases the speed of the blower motor.
Well, I am not one whoto just throw parts . Without this part you will not be able to change the speed of the airflow from the blower motor.
It is also possible that the heater motor blower may not work at all. If the resistor has gone ba it is likely that the fan will work only on the highest speed. The blower selector switch that is located in the cabin of the car helps to regulate the flow of air being let in.
DESCRIPTION The blower motor resistor is mounted to the HVAC air inlet housing, directly b. I definitely agree with the answer from rj7and just want to add to it. They build up higher resistance and that extra draw can destroy resistor.
Low speed settings (1-3) for my Ford Taurus stopped working. This video shows how to replace the motor blower resistor to fix the issue. I had the exact same problem with the blower motor but did not know how to fix it.
There is one blower motor that works for all climate control modes: air conditioner , heater and defroster.
Do not tighten any of the screws until all screws have been threaded in by hand. Types just controlling the fan . Heater Blower Resistor with climate control. Took less than minutes start to finish.
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