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Will a blower motor work without the resistor?
If the resistor shorts or fails, it may cause the blower motor to remain stuck on one fan speed. The heating and air conditioning systems may still function at one speed, however the resistor will have to be replaced in order for full functionality to be restored.
What are the symptoms of a bad blower motor resistor?
If the airflow from the vents is weak… If you try to increase the air pressure and you feel no difference in the pressure blowing, then your blower motor resistor may be failing. A damaged blower motor resistor will work on one fan speed which may not be enough to keep the inside of your car cool or warm enough.
What does the blower motor resistor connected to?
The blower resistor is connected in series with the blower fan. This means that the current running through the blower motor, and thus its speed, is controlled by the resistor value. There are also two additional circuits used for the off state and the highest fan speed state.
How do I test a blower motor resistor?
Blower Motor Resistor Testing Place one lead of the Ohmmeter on terminal 1 of the resistor. Place the other lead on terminal 2 and check against specifications. If this circuit is open, showing infinity on the Ohmmeter, the blower resistor must be replaced.
Why do I need a new blower resistor?
Some of my friends say I need a new blower resistor because that controls the air flow or something and others say blower motor. I believe if I am moving on “no circulation” and the air is coming through the vents, then the blower motor is fine. Or that its just my vents are open and the air is coming from somewhere else.
How can I tell if my blower motor resistor is malfunctioning?
If corrosion is not the problem, then another way to test to see if the blower motor resistor is malfunctioning would be to attach an ohmmeter to it and measure the resistance. It should read at 4 to 5 ohms if it’s working properly.
What kind of transistor does a Sentra blower use?
It looks like that year Sentra uses a field effect transistor and not a traditional resister. It’s referred to as the Fan Control Amplifier and controls the ground circuit of the blower motor. The power side is relay controlled and fuses 10 & 11 in the underdash fuse box should always be hot with the ignition on.
How does the resistor on an air conditioner work?
As you turn up the knob on your air conditioner, the resistor tells the blower motor to increase the speed and blow more air. Turn it down and the opposite happens. It’s an electrical component and it works by sending electrical signals that correlate to the information you send by adjusting the dial.