An air conditioning unit includes many components that work together to regulate and keep temperatures comfortable in your home. One of the most important parts of your air conditioner is your AC motor, which is used to move both air and refrigerant through your system to keep things cool and comfortable.

What Is a Blower Motor?

Your AC motor helps to circulate conditioned air through vents in your home. An electric fan operated by this motor causes air to move through various ducts and vents in your home. When your motor is efficient, even a small fan can move large volumes of air through your system. When it is not, however, you’ll soon see evidence of this dysfunction in and around your home.

When an AC Motor Needs to Be Replaced

Like other components in your system, the AC motor becomes vulnerable to failure due to aging, wear and tear, and particulates that clog your system. Signs that your AC motor needs replacing include:

  • Weak airflow coming from vents and ducts
  • Little or no airflow, indicating an obstruction somewhere in your system
  • High energy bills
  • Unusually loud sounds coming from your system
  • Overheating of your system

Replacing an AC Motor

Maintaining and repairing your HVAC system is complicated work and should be left up to qualified HVAC professionals with knowledge of and experience with different systems. A qualified contractor must consider a number of things related to your system to identify and then install the right motor. Factors such as diameter, drive, rotation direction, voltage, speed, and size all play a part in making sure your unit functions as it was intended to. As you familiarize yourself with different types of AC motors, read on to discover how your HVAC professional might replace your AC motor to get you up and running again.

Power Shut Off

After your HVAC technician has determined the exact location of your fan motor in your unit, they will need to turn the power off to the unit and perhaps to a portion of your home before beginning work. Shut-off and disconnection panels are typically located on a wall next to the compressor. If these cannot be located, your technician will turn off the power supply to your air conditioner using the main electrical panel of your home. In some cases, it may be necessary to test electrical power with a voltmeter to ensure that all power to the unit has been turned off. This way, anyone working on your unit will greatly reduce their risk of experiencing an electric shock.

Diagnosing the Cause of the Breakdown

Your technician will then determine the cause of the AC system dysfunction. Common causes of motor failure include wear and tear, overheating of your system, and debris that has clogged up various components of the motor itself.

Removing Clutter

Removing debris such as dust, dirt, leaves, and other items from the outdoor condenser will reveal the protective grille. A technician may use a brush or other tools to carefully remove dirt and debris without damaging the unit’s outer protective grille. Once the grille has been revealed, disassembly and reinstallation can take place.

Removing the Grille

The protective cover, or grille, is then lifted to reveal the inner components of the fan and motor. Screws that hold the grille in place are loosened to make removal easy and efficient.

Cleaning Fan Blades

Your technician will use a soft brush or cloth to remove dust and debris from the fins of the air conditioner. Right beneath these fan blades sits the fan motor of the air conditioner. In some cases, excessive debris might call for a vacuum as well to prevent additional debris from falling into the motor itself. Once the blades are completely clean, it will be easier to remove them and reveal the motor.

Removing Wiring

Directly below the fins sits the AC motor. It is attached to the fins with a series of wires and switches. In some cases, it may be necessary to lubricate this component to make it easier to remove. Your technician will disconnect specific wires before lifting the AC motor up and out of the condenser unit. After removing the fan blades and setting them aside, they will remove mounting screws and then lift the disconnected motor out of the unit, preparing the unit for a new motor mechanism.

Installing a New Motor

Installing a new AC motor is a reverse process of disconnecting the old one. Your technician will string the connecting wires through a guide or guard on your unit to help keep everything neat and tidy in your electrical component space. The new motor is then securely affixed in its new position; mounting screws will then be tightened to ensure that the new motor has a solid foundation for the important work of cooling your home. Careful attention must be given to tightening these mounting screws, as putting too much tension on them can cause them to break or snap off, making completion of installation difficult.

Fan blades are then ready to be reinstalled. Fan blades must be adjusted to allow for room on both sides in order for them to move air efficiently through your unit. Your technician will make sure there is enough space above and below fan blades to allow for free movement without risking damage to the blades or your unit. Fan blades will also need to be tightened to ensure that they remain in place while they are operating at full speed.


Your AC technician will then begin the process of reconnecting and rewiring your unit to ensure that all components are in place and secured to avoid being accidentally cut by rotating fan blades. There should be guides inside your electrical component box that allow for the placement of wires that will protect them from rotating fan blades and moving motor parts. Once the motor, fan blades, and the top of your unit have been put in place, wiring needs to be pulled tight to ensure that it stays away from other moving parts at the top of your unit.

Tightening and Securing

Once all components of the motor, fan, and wiring are back in place, the unit will then be topped and tightened down by your technician. The technician may perform a test using a screwdriver to ensure that fan blades are placed correctly inside the unit. As a final test, your technician will turn the power back on to your unit and test it to ensure that all parts are working correctly. These final tests and steps are a necessary part of ensuring that work has been performed correctly and that you have access to cooler, more comfortable air in your home once more.

Leave It to The Experts!

At Cook’s Air Conditioning and Heating Specialists , we provide a variety of solutions to keep you cool and comfortable in your home. Our experienced, professional technicians are ready to provide you with AC and heating repair, installation, and maintenance. We also provide indoor air quality solutions and commercial services. Our team offers a 100% satisfaction guarantee and ensures that all work is performed efficiently, expertly, and in a timely manner. Call us today to set up an appointment or learn more about our services.

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