Everything You Need To Know About An HVAC Blower Motor

What Does A HVAC Blower Motor Do?

HVAC systems’ main purpose is to sustain clean and safe indoor air quality through ventilation and filtration and provide thermal comfort.

There are so many different pieces to your HVAC system. Some find that knowing what each part does and how they work together is intimidating.

What does a hvac blower motor do? A blower motor makes the fan turn, allowing the outgoing air to flow out of the system. The air will then be distributed inside your home, providing better air quality. Blower motor brings the temperature set on your thermostat to your house.

This article dives into a little education about the blower motor. This will be your quick guide on understanding the works and importance of your blower motor.

What Is A Blower Motor?

A blower motor is a component of your heating and cooling system that has three basic sub-parts:

  • Assembly of the fan
  • Engine
  • Case Cover

The blower motor operates at a manageable pressure. It provides a current of steady air that is then supplied to the home via ductwork and vents. Simply put, your blower motor is designed for your home to supply and disperse air.

Bear in mind that high-speed blower motors are suitable for air conditioning systems that require high-pressure fans. On the other hand, low-speed blowers are intended for heating and air circulation.

The most famous instance of a blower motor is forced-air HVAC systems. A blower motor is also used in cars.

When you operate the heating system, it is the part of the system responsible for moving the hot air around your vehicle.

To provide cool air while the air conditioning system is operating, it also blows through the car’s AC evaporator.

Types Of Blower Motors

A blower motor has two main kinds. The first is the choice for single-speed. When the thermostat reveals that your home’s temperature has fallen or risen beyond the optimal setting, single-speed blower motors will turn on.

Variable speed is the second type of blower motor as it can run at various speeds. Variable-speed blower motors vary from single-speed blower motors, helping them better control the airflow in your home.

More energy efficient are variable speed blower motors. They draw around 2-4 amps, where the older type engines draw around 12 amps.

Amps are the sum of energy used by the engine. The lower speed adds to the results, too.

The air in your home often circulates more often with variable engines, which can prevent cold spots in your house.

Finally, variable velocity blower engines tend to run with less noise than single-speed blower engines.

How Does It Work?

To control the temperature, thermostats work with the home heating and cooling systems. It lets the furnace know when to get to work when the temperature drops below the thermostat setting.

The cold or hot air produced by the furnace then needs to circulate throughout your house’s different rooms.

The blower motor will take the heated or cooled air from the furnace and will circulate it throughout the home. This ensures the temperature reaches the thermostat needs.

This is done by a spinning fan that blows the air throughout the ventilation installed in your home. A smaller blower motor can move a large sum of air, too.

On the other hand, a single-speed motor operates only at one speed. However, it uses full energy capacity as well. If you’re wondering how to tell when to switch on or off the blower motor, simply take a look at your thermostat.

This kind of speed motor only runs when signaled, therefore usually results in cold sports.

Conversely, variable-speed motors are at lower speeds and blow air higher if you want them to. This motor finely distributes air in every room of your house.

Another upside of variable-speed motors is how energy efficient it is compared to single-speed motors. This will help you save bigger on your energy bills.

Lifespan Of A Blower Motor

Blower motors, like all electrical motors, would ultimately either require repairs or completely fail. The brushes within the motor will begin to wear over time and through daily usage.

This decreases the motor’s capacity. The blower motor bearings may also lose their initial lubrication and begin to dry out, causing increased engine friction.

The blower motor can last anywhere from ten to twenty years in your home or workplace. The life cycle can be driven to its limit of twenty years by modern sealed bearings and sealed bushings.

Proper cleaning and maintenance will also increase the lifetime of your machine. After several years of use, if your motor starts to malfunction, our qualified technicians will help you pick a new device.

Maintaining A Blower Motor

Resistor, fan relay, and climate control switch problems involve common issues with blower motors. It is easy for an HVAC technician to correct most of these repairs. Other problems may occur, but they are much less common.

To ensure that they operate properly, blower motors need maintenance. If you find that your HVAC system is running continuously, you may want to contact an HVAC repair company, but your home’s temperature does not meet standards.

Regular maintenance can help avoid these issues from happening in the first place, but should the need occur. An HVAC technician can also fix or replace a blower motor.

It is a smart idea to get the HVAC service provider on a plan to come out before it begins to get hot in the summer and cold in the winter.

A technician should make sure that the blower motor is functioning correctly during these sessions. Besides, they should make sure that the fan blades are clean.

There should be no signs of wear and tear in the motor belt, and that the motor should have lubricant.

Signs Of A Blower Motor Issue

Fortunately, you don’t have to guess if you need a blower motor repair. There are some tell-tale signs that will tell you it’s time to call the pros of One Hour Heating & Air Conditioning from Duggan. Such signs include:

  • Humming noises that come from the unit
  • After a few hours, the machine can no longer function.
  • There’s no cold air going into your house,
  • You hear a fan going outside, but there’s no cold air coming into your house.
  • Exceptionally High Energy Bills
  • Intermittent Functioning

The problem can only continue to develop and become more costly to repair down the road if repair is overlooked. It may cause various other components of the device to break down or overheat if not repaired quickly.

Is Replacement Necessary?

To make air circulation more effective, many modern HVAC systems have blower systems. As a direct drive blower motor, one of the most common types of blower motors is considered and is used in modern furnaces.

If you think that your blower motor is out, below is a guide for troubleshooting to help you find out if it’s the issue.

  1. Spin the Blower – Start by turning your furnace off. Try to spin the blower by hand until the power is out.

  2. Blower Spins Freely – Check to see whether the motor is hot if the blower spins freely. Enable it to cool if so. Checking the running capacitor will let you know if the motor is overworked and if repairs are needed. Switch on the power of your furnace and look at the blower.

  3. If your blower does not turn when you try to spin it by hand – Check to see if your blower motor has oil ports. Blower Does Not Spin Freely Add a few drops of oil and notice if the spinning helps.

    If no oil ports are available or the blower does not spin freely after lubricant is applied, it will need to be replaced.

Troubleshooting An HVAC Blower Motor

Regular maintenance of the HVAC system helps to keep the blower motor in peak condition. It also reduces the probability of malfunctions with this significant part.

They occasionally encounter issues. Try these troubleshooting steps before calling Sanborn’s for HVAC repair if you encounter trouble with your HVAC blower motor:

  • Does the heating and air mechanism switch on, but the blower motor does not? Switch the machine off, and power is cut.

    Then to access the part, remove the access screen. Clear away the accumulation of dirt and debris on and around the engine.

  • Didn’t the blower engine and machine turn on? Check the power source on the electrical panel in your house. Make sure it has not flipped the breaker. On the unit’s exterior, check the on/off switch and verify that it is on.

If these troubleshooting steps do not restore work, a mechanical or electrical failure has likely been encountered. Your blower motor needs a qualified technician to intervene to repair it.

Choosing A Blower Motor

It’s safer to get an exact replacement unit when selecting a replacement blower motor for your furnace. Locate the serial number on your blower motor and check with the producer to see if they have one available.

You will generally find a universal model compatible with your furnace if a replacement is not available.

When shopping for a replacement blower motor, you will need to account for:

  • Drive Form
  • Motor Diameter
  • Voltage
  • Horsepower
  • Speeds,
  • Rotation Direction
  • Run Capacitor Size
  • Mounting Process.

Blower Motor Installation

The blower motor is just behind the glove box, is a form of a fan mounted inside the heating ventilation and air conditioning ducts. The motor is located behind a heater core and an air-conditioning evaporator inside the case.

The blower engine sucks in air and blasts it over the heater center when someone turns the heat on, supplying warm air from the vents.

Similarly, the blower pushes air over the cold evaporator with the air conditioning working. You should get a skilled technician to mount the blower motor to avoid any potential problems. The blower motor helps your ventilation system to work, after all.

Your home or business could become very uncomfortable without a properly mounted blower motor. For as long as possible, you need your blower motor to function well.

How To Find A Reputable HVAC Contractor

Replacing blower motors plays an important role in creating safe and healthy air quality indoors. Thus, this is a substantial investment.

However, before purchasing, see to it that the motor is from a reputable contractor. Reputable contractors offer high-quality products and services.

Make A List of HVAC Contractors

There might be several HVAC contractors in your state, and this may serve as a challenge. The internet will be your best friend for this. Do your research and list down your options for HVAC contractors near or within your state.

You can look for reputable HVAC contractors on Facebook, Yelp, Better Business Bureau, and Home Advisor. As you make a list, do not forget to check the reviews of each business page.

But if you’re too tired to do this, you can ask your peers or family if they know any trusted contractors to fix your HVAC.

Search For Licensed And Certified Establishments

Reliable HVAC companies have certifications such as Diamond Certified and NATE. These certificates indicate that they can provide top-notch air-conditioning services.

But at the same time, if they fail to show any of the certificates, it doesn’t mean that they are not qualified enough.

Your family’s security must always come first, and to ensure that, you can do a background check. Make sure that all of their specialists are EPA-certified, licensed, and insured.

Visit their website and look at their marketing materials. You should be able to see all the contractor’s license numbers.

See To It That The Contractor Conducts An Inspection

The best HVAC company companies would never recommend repairing your HVAC without conducting a proper and thorough examination.

Proper assessment of the system will influence their decision as to what engine is compatible with your AC. They will provide a detailed quotation if the system needs a repair.


The blower motor plays a crucial role in the system since it is the component responsible for circulating heated air. The blower fan also acts to disperse chilled air in the home during the cooling process.

If it malfunctions, contact a specialist before deciding on any repair.

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