Change Your Home One Step at a Time

Change Your Home One Step at a Time

How To Extend The Life Of Your HVAC Blower Motor

by Aiden Carroll

Throughout the year, your HVAC system is almost in constant use. During the summer, your air conditioner works hard to keep your home comfortable. While winter chill sets in around your home, your furnace provides the heat that keeps your home hospitable. Even though each of your appliances are only used for a certain period of the year, they share one vital component—your blower motor. To ensure that your HVAC system can continue to operate all year round, perform or arrange for these maintenance tasks.

Keep It Clean

Although your HVAC filter does a great job of trapping the airborne debris and allergens throughout your home, it isn't capable of keeping your entire HVAC system clean. As dust, pet fur, and other large debris passes through cracks in your furnace housing or air ducts, it will be pulled into your blower motor.

The debris that enters your HVAC system will settle on the fan wheel inside your motor. When this happens, The debris reduces the airflow throughout your entire system. As more debris continues to enter your blower, it will encase your motor. Without sufficient airflow, your blower motor can quickly overheat during long or demanding periods of operation.

Nearly all blower motors have a built-in safety feature that forces them to shutoff if they become too hot. However, if this shutoff feature occurs frequently, then the high temperatures will still cause damage to your motor. Wiring, capacitors, and other sensitive electronics inside your motor can sustain permanent damage from frequent overheating.

Unfortunately, cleaning your blower motor isn't an easy task. To do so, you must remove the blower assembly from your HVAC system, dismantle it, separate the fan wheel from the assembly, and disconnect the motor. Since these steps vary slightly from one blower assembly to the next, it's best to leave the task of cleaning your blower motor to a certified HVAC technician.

Check The Oil Ports

Depending on the blower motor model in your system, you may need to periodically add lubricating oil. Although most modern blower motors have sealed oil ports that don't require additional oil, older blower assemblies typically have unsealed ports that require periodic lubrication.

Check your system's owner manual and determine whether or not your blower assembly requires periodic lubrication. If it does, you can perform the task yourself—if you're willing to get your hands dirty.

To lubricate your blower motor, you'll need to shut off the power to your HVAC system and remove the mounting bolts from your blower. Disconnect the wiring between your blower and HVAC system and partially pull your blower assembly from its housing. Use a ratchet and socket to remove the screws on the side of your blower motor and carefully pull your motor out from the assembly. Identify the oil ports on the motor (there are typically three or four labeled ports) and fill them with the oil specified in your owner manual.

Test The Amperage Annually

Even if your blower motor doesn't experience frequent overheating or other operating issues, it may still sustain damage from an intermittent or surging power supply. To ensure that electrical problems don't force you to arrange for a replacement blower motor installation, have your motor's amperage tested at least once a year by a professional.

Your motor's specific amperage will vary based upon it's programming. Your motor doesn't just spin at one speed—it's speed changes to adjust to the appliance your using and the settings on your thermostat. Each speed setting has its own amperage and must be tested for proper operation.

If your motor's amperage is above normal, then your motor can burn out from being overworked. By testing the amperage periodically and replacing various components of your motor when necessary, you can avoid experiencing a complete motor failure.

Don't run the risk of letting your HVAC blower motor experience an unexpected failure when you need to use your air conditioner or furnace to keep your home comfortable. Instead, perform or arrange for these maintenance tasks on a regular basis to ensure that your blower motor lasts as long as possible.  For more information, check with sites like


About Me

Change Your Home One Step at a Time

The best way to handle major home renovations is to take them one step at a time. Instead of trying to change your whole home at once, start small. I started with the guest bathroom, then the guest bedroom, then moved on to my kids’ rooms, my bedroom, and the living room. Now I’m working on remodeling the kitchen. I started this blog to help other people who are attempting major home renovations. I’ll show you how to change your whole home by breaking it up into manageable chunks. Wondering which kitchen counters are right for you, or how to add more space to your bedroom? We’ll go over the pros and cons of different materials and discuss DIY renovation projects. Before you know it, you’ll have created your dream home.