Here are some of the warning signs of a bad heater blower motor resistor:
Fan does not work at all, so no air comes out of the vents.Fan only works on some speeds and not others.Fan only works on the highest speed.Fan runs all the time and can’t be controlled with the fan switch.You see smoke coming out of the vents.
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.
Why do blower resistors fail?
In most cases, a blower motor resistor fails due to corrosion or overheating. Sometimes, the mechanical resistance to the motor rotation causes an excessive electric current that can overheat and prematurely damage the blower motor resistor.
What are the symptoms of a bad blower motor?
What Are Signs Your Blower Motor Needs to Be Replaced?
Poor or Airflow from Air Vents. This will be the first and most obvious sign your blower motor has a problem. No Airflow At All From Vents. Skyrocketing Energy Bills. Strange Noises When You Turn on the Heat. Overheating Blower / Weird Smells.
Can a bad blower motor cause no heat?
Problems with Your Blower Motor or Blower Motor Resistor
Without it, there’s no circulation of air—hot, cold, or otherwise. The blower motor resistor is the part that controls the fan speed of the blower motor. Both of these components can fail, resulting in the heating system simply not working.
Can a bad blower motor resistor cause no AC?
The most common symptom of a bad blower motor resistor is the blower motor will only work at one or two speeds. It can also cause the blower motor to stop working completely and you will notice no air coming from the vents.
How do I test a blower motor resistor?
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.
Can you repair a blower motor resistor?
The average cost to replace the blower motor resistor at a repair shop is between $44 and $55 in parts and $70 in labor costs, for a total cost of around $114 to $125. On the other hand, you can easily fix the blower motor resistor at home in about an hour (even if you’re a beginner) and for around $70.
Why does my blower motor only work on high?
When a blower resistor fails, the highest fan speed usually is the only one that still works because it essentially bypasses the resistor and receives the maximum amount of voltage. When the resistor is working, it reduces the amount of voltage going to the lower fan speeds so the fan runs slower.
What causes heater resistors to burn out?
What causes heater resistors to burn out? Trent, one of the biggest reasons for blower motor resistors to have shorten life is actually because of faulty blower motor drawing too many amps, some times melting wires/plugs, heating up resistors shortening their life.
Why is my blower motor so loud in my car?
Loud noises you hear when your car’s heater or air conditioner are on typically indicate a blower motor issue. The good news is that a blower motor problem like this can be the result of something as simple to fix as debris or trash that got caught in it.
Can I run my car without a blower motor?
Your car’s blower motor is not only necessary for the operation of your air conditioner. Without a functioning blower motor your engine runs the risk of overheating.
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