Comprehensive Guide to the AC Blower Motor

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The air conditioner’s primary task is to cool the air in your acclimatized environment, but how does this air get circulated far enough for you to enjoy it? The task of circulating the cooled air through your house falls to the AC blower motor. But if something were to go wrong with this important component, the entire function of the AC can be compromised.

In the following article, we will look at some of the most important things you should know about keeping your AC blower fan in proper order.

What is a Blower Motor on an Air Conditioner?

The blower motor is an essential component of the AC system. It blows the cool air into the interior of your home through the vent system. The blower motor itself turns the blades of the fan that move the air and circulate it throughout the house. Two different types of blower motors can accomplish this.

How Does an AC Blower Motor Work?

The blower motor causes the fan to function and allows for the air to be circulated the room. This allows for the air to be passed over and through the evaporator coils. Within the evaporator coils, the refrigerator gas is what will absorb the heat from the air and then send it to the exterior of the home. Then the cooled air can be rerouted through the ductwork and passed to every room of the house through the ventilation shafts.

As you can see, the blower motor has an essential task in the function of the AC unit. Should this important component fail, the rest of the air conditioner will also be rendered useless.

How Much Do Replacements for the Blower Motor Cost?

This can depend on various factors; the average AC blower motor will cost around $400 for a new replacement. But you could probably find a second-hand option that will cost around half that much if you shop around.

Here are some of the essential factors that you will need to consider when calculating the costs of a new AC blower motor.

  • Manufacturing Brand
  • Year of manufacture
  • Capacitor
  • Type of motor and mounting
  • Size of the AC system – bigger AC units will use bigger blower fans
  • If the OEM motor designed for this AC is unavailable, equivalent matches will be needed that align perfectly to the original’s voltage, rpm, and horsepower.

How do I know if my AC’s Blower Motor Needs Replacement?

Here are some of the most common signs that your AC’s blower motor is not functioning properly and will need to be replaced.

1. Weak Airflow

The first and most obvious issue will be if the airflow from your AC through the vents is slow and weak. This means that the blower fan is not functioning to optimal capacity.

2. No Airflow

Much in the same way, if you see that there is no airflow coming through the vents, this is a good indication that something is wrong with the blower fan, and it has become completely inoperable. When this happens, the entire motor will have to be replaced. But there can be other reasons that the airflow from your air conditioner has stopped working. Some of the most common include a faulty thermostat, bad battery or relay or even a problem with the fan control. Unless you have extensive experience in figuring out these malfunctions, it is a good idea to have a qualified AC technician check the system and determine exactly what the problem is.

3. Overheating

There are a variety of issues that can cause the blower motor to overheat. The most obvious would be an accumulation of dirt, hair and other obstructions that impede the functionality of the blower fan motor. This can cause the blower motor to work harder and heat up. The best way to address this issue will be to restore your AC to full functionality with a professional technician.

4. Strange Sounds

Strange noises coming from your AC motor are another indication that your fan and blower motor are not functioning optimally. If you hear noises like banging, clanking, rattling, screaming or screeching coming from your AC, this could be a sign that something is out of line or has come loose. Some of these issues can be repaired, but others will require the complete replacement of your motor.

Sometimes the sounds can be like a loud banging, which indicates that something is not properly connected or has become damaged in some other way. When this happens, the entire blower motor will need to be replaced.

5. Unusually High Energy Consumption

The blower motor in the AC unit is the component that uses the most energy. If you have noticed that your energy bills are coming in especially high and you can’t be sure why that is, the problem could be an issue with your blower motor. This is typically caused by an older, dirty or malfunctioning blower motor that is working extra hard to keep cooled air circulating through the house. This extra strain will cause the motor to use more power to complete its task.

If your air conditioner has a single-speed motor and it is getting old, you may cut back on your energy costs by replacing it with a variable speed motor. These more advanced blower motors adjust energy usage to the varying cooling needs they have; this dramatically reduces the unit’s energy consumption.

How Long Should an AC Blower Motor Last?

A blower motor can last anywhere from 10 to 15 years. Some of the better designed and constructed blower motors have sealed bushes and bearings and can last for a full 20 years. One good way to extend the longevity of your blower motors is by keeping the vents and ducts of your home and AC system cleaned regularly.

What Can Cause a Blower Motor to Stop Working?

One of the most common reasons your blower motor will stop working is that the resistor has failed, often because of overheating or corrosion. In some other cases, the rotation of the motor can become hampered because of mechanical resistance. This causes an electrical charge that causes the motor to overheat and can prematurely burn out the resistor. This commonly occurs when the bearings in the motor are worn out and do not spin properly. Other causes could be the presence of a foreign object in the motor that prevents the motor from rotating properly.

Why Is the Blower Motor so Loud?

If there are loud rattling or screeching noises coming from your AC blower motor, it could be that the bearings within have been compromised. To prevent this, the blower fan needs to be kept lean and properly lubricated, or the fan may begin making loud noises and then fail altogether.

Can an AC Blower Motor be Repaired?

It is practically impossible to fix an AC blower motor once it has become broken or faulty, and the best course of action involves replacing it with a new or second-hand blower motor. If there is adequate power, but the blower fan is not working as it should, it is reasonable to assume that the blower fan needs to be replaced.

How to replace blower motor


Hopefully, this article has given you a good idea of what the blower motor is, how it works, and how to keep it from premature failure. We hope that this information will help you keep your air conditioner in proper functioning order so you can enjoy comfortable temperatures on the hottest days. If you begin to have problems with your blower motor, don’t hesitate to contact us.

Related read: Aircon Parts Overview

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