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What happens when the blower motor resistor goes out?
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 would cause a resistor to burn up?
Burning of Resistor When a resistor has been overloaded with voltage exceeding its power rating, the resistor will become very hot to touch, darken considerably and possibly even melt or catch on fire.
Is my blower motor or resistor bad?
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.
When should I replace my blower motor resistor?
If there is no air pressure blowing from the vents, then your blower motor resistor needs to be replaced in order to start working again. Usually, overheating is the cause to a failed blower motor resistor.
What happens if the resistor on a blower goes bad?
This symptom isn’t limited to a bad blower motor resistor. A broken blower motor switch can also stop the blower from changing to certain speed settings. If your blower motor cannot change to certain speeds, check both the resistor and the switch on your dashboard. The most common failure points are the resistor and the motor itself.
How to test a blower motor resistor in the garage?
Look for obvious signs of corrosion and burns from overheating. If you see signs of overheated connectors, replace the blower resistor and its connector, but again, you must splice the wires right, or you’ll have problems at the splice later on. Inspect the resistor visually. Look for obvious signs of corrosion and burns from overheating.
Why is my blower stuck on high speed?
A blower stuck on a high-speed setting will keep blasting you with hot or cold air when you don’t need it, though one that’s stuck on the low setting can be just as frustrating. This symptom isn’t limited to a bad blower motor resistor. A broken blower motor switch can also stop the blower from changing to certain speed settings.
Where does the power go in a blower motor?
To run on the slowest speed, the power runs through all three resistors. For each higher speed, power flows through one less resistor. Some car makers run blower motor power through the fan speed switch first, then through the blower motor resistor and then to the blower motor and ground.