What Causes A Blower Motor Resistor To Go Out

April 21, 2024 Post a Comment

What causes a blower motor resistor to go out

In most cases, the blower fan resistor is failing either due to overheating or corrosion. If the blower fan fails, your car will not blow any forced air. However, sometimes the problem can be with the blower motor itself. This is especially apparent when you have replaced the blower fan multiple times.

Why is my blower resistor keep burning out?

If your blower motor resistor continue to fail you do want to do a few things. First check the amperage that the new motor pulls. If it is to high then there are issues with that. After that you do want to check for corrosion on the wiring and connectors since that can cause heat which may cause failure.

How long do blower motor resistors last?

The blower motor resistor is designed to last for the car's lifespan. In most cases, these resistors will wear out long before the car does. Usually, the wear that the blower motor resistor has is due to the constant use that it gets and the heat that it is exposed on a regular basis.

What are the signs of a blower motor resistor going out?

Signs of a Bad Blower Motor Resistor Loss of HVAC fan control (total or certain speeds) The fan only works on its highest speed setting. No air coming from vents. Intermittent or inconsistent fan speed.

What causes resistor failure?

A fixed composition resistor normally fails in an open configuration when overheated or overly stressed due to shock or vibration. Excessive humidity may cause an increase in resistance. A variable composition resistor may wear after extensive use, and worn away particles may cause high resistance short circuits.

Will a blower motor work without the resistor?

There are instances where a bad resistor will prevent the current from reaching the blower motor altogether. Without any power, the motor won't run. As a result, the blower fan stays still and silent, and no air blows out of the vents.

Is there a fuse for blower resistor?

A fuse is often located on the resistor board. The fuse only protects the low and medium blower speeds. High speed will still work if the resistor fuse is blown.

Should I replace both blower motor and resistor?

The heater blower motor resistor can often go bad because of a bad heater fan, and therefore you often have to replace both the heater blower resistor and the fan.

Should you replace blower motor and resistor at the same time?

We do suggest that you replace the resistor at the same time. It may not be critical, but this will keep the system more uniform. The issue may even be related to the resistor. If you know that it is not related to the issue, then you do not have to replace it.

How much does it cost to fix a blower motor resistor?

How much does a blower motor resistor cost? To replace the blower motor resistor, it would cost you anywhere between $50 to$150 – this includes the cost of equipment and labor.

How do I test a blower motor resistor?

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How do I know if a resistor is failing?

If the resistor is fine, the multimeter will show its value in Ω, kΩ, or MΩ. However, if the resistor is bad or damaged, the multimeter may display 0 or 1. If the value 0 is displayed, the resistor is damaged, and the current can't pass through.

Does blower motor affect AC?

The blower motor blows conditioned air through vents in the home. The air conditioner circulates the cool air through the home to the temperature on the thermostat. This is done by spinning the air and it moves through the vents and ducts in the home. As the HVAC system ages, so does the blower motor.

What is the most common resistor trouble?

The most common problems to occur with fixed resistors are a change in resistance or a complete failure. A complete failure occurs when the resistor overheats and burns out. When the resistor interior is burned out, it produces an open circuit.

What affects a resistor?

There are 4 different factors which affect resistance:

The type of material of which the resistor is made.
The length of the resistor.
The thickness of the resistor.
The temperature of the conductor.

When resistors burn out they usually short?

A resistor seldom fails short. If it is getting hot enough to fail, a short would typically dissipate even more power and cause the material to ignite or explode.

Can I use a capacitor instead of a resistor?

No. Capacitors have a frequency dependent impedance and the magnitude of that impedance is expressed in ohms. But that does not make them a resistor.

Can you drive a car with a broken blower motor?

Should you drive with a bad heater blower motor? A bad heater blower motor will not affect the safety of your car, with the possible exception of you not being able to clear the windshield of snow, ice, or condensation if the defrosters don't work.

Can you drive with no 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.

What happens when a blower motor relay goes bad?

If the blower motor relay develops any sort of problem that hinders its ability to properly limit and distribute power, it may cause the blower motor fuse to blow. Any sort of electrical spikes or excessive current from a bad relay will blow the fuse and cut power in order to protect the system.