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How Your HVAC Technician Cleans Your Blower Motor

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As a homeowner, you're responsible for maintaining several components of your home—including your HVAC system. In order to save your wallet from wearing itself thin, you've learned how to replace your air filter, clean your air ducts, and even clean your furnace's burner assembly. However, after several years of use, your blower motor is starting to operate less efficiently—and although you can maintain other parts of your HVAC system, your blower motor is too complicated to repair by yourself. Instead of attempting to perform this maintenance task, hire an HVAC contractor to do the job for you. Here's how they'll do it:

Preparing For The Job

Before breaking out their tools and disassembling your furnace, your technician will consult with you to discuss the problems you're experiencing with your furnace. Since several of the symptoms caused by a dirty blower motor can be caused by an electrical problem or an airflow restriction, your technician will need to ensure that the symptoms you're experiencing are in line with those caused by a poorly-maintained blower.

Your technician will perform a visual inspection of your blower motor to determine whether or not it's causing problems. Additionally, your technician will ask you about what type of maintenance your furnace has received over the past few years to gain a better understanding of your potential HVAC issues.

Blower Removal

If your technician determines that your blower motor is in need of a cleaning, then they will need to remove your blower motor. To do so, your technician will shut off both the power and gas supply to your HVAC system and open the access door on your blower motor compartment.

Before pulling your blower out of your compartment, your technician must delicately disconnect the electrical wiring between your motor and HVAC system. In some cases, the wiring may need to be cut and replaced or spliced when your blower motor is reinstalled into your furnace. To ensure that the wires are reconnected correctly once your blower motor is cleaned, your technician may label each set of connecting wires.

With the wiring disconnected, your technician can remove the fasteners that secure your blower assembly and pull your blower assembly out of its compartment.

Breaking It Down

Your blower motor is a centrifugal fan that operates by spinning a large fan wheel. As the fan wheel rotates, the blades of the wheel push air into your HVAC system. Your technician must dismantle your blower motor to clean debris from the blades of the fan wheel. Additionally, your blower motor must be separated from your fan wheel prior to cleaning.


Once your blower motor and fan wheel are separated, your technician will use a gas duster or air compressor to clean the internal electronics of your blower motor. If debris isn't blown out of your motor, then it can overheat, sustain permanent damage, and operate intermittently—if at all.

If there's only a moderate amount of debris on your fan wheel, then your technician will once again use a compressor or duster to clean it. However, if your fan wheel's blades are buried under a thick layer of debris, then your technician may choose to clean it with a garden hose.

Reassembly and Testing

After thoroughly cleaning your blower motor and fan wheel, your technician will put your blower assembly back together and reinstall it into its housing. Your technician will then test your blower at every power level to ensure that it operates correctly before packing up their tools and moving on to their next call.

As you can see, cleaning your HVAC system's blower motor is no easy task. If you haven't had your blower motor cleaned in several years, then contact a furnace repair technician right away for an inspection. By having your blower inspected and cleaned, you can ensure that both your furnace and air conditioner operate as efficiently as possible.