Where Is The Blower Motor On A Furnace? Quick Guide


Debarghya Roy

Homeowners often forget about their furnace blower motor. But it’s super important for keeping the house warm and air circulating properly. When the energy bills skyrocket and warm air isn’t circulating, it’s a sign the blower motor’s not working. Replacing it can save money and protect the HVAC system.

Blower motor replacement costs vary, depending on brand, model, and type. It’s a tough job, but you can do it by following a step-by-step guide. Regular maintenance can extend a blower motor’s life but sometimes replacement is necessary. Georgia Air professionals can help with repair or replacement of HVAC components.

where is the blower motor on a furnace

What is a Blower Motor?


A Blower Motor is an electric motor that powers a fan to circulate air. It drives fan blades, pushing out hot or cold air from ducts. The motor speed adjusts to regulate air flow.

These motors come in various sizes and configurations. They can be powered by DC or AC current, and single or three-phase power. In vehicles, they are used for heating and cooling. In industrial settings, they are used in ventilators.

Safety must be considered when installing or maintaining a blower motor. Follow industry standards like OSHA guidelines. Wear gloves and goggles where necessary.

Pro Tip: Always refer to the manufacturer’s specs for proper installation and maintenance. Let this motor keep you comfortable without a lullaby.

How Does a Blower Motor Work?


A Blower Motor is very important for an HVAC system. It takes outside air and sends it to the vehicle or room, depending on the application. This motor moves air and controls the speed and direction. It has an electric motor and fan blades in a cage-like assembly. This gives hot or cold air depending on the demand.

The size of the motor varies. Some are big for high-volume airflow. Others are small for portable heaters or compact vehicles.

Unfortunately, people sometimes forget to maintain their blower motor. One family had strange noises, but they ignored them until the motor stopped working.

It’s essential to understand how this motor works. Regular care can make it last longer and improve air quality. So, if your blower motor isn’t working, don’t wait, give it the boot.

Signs of a Faulty Blower Motor


To identify the signs of a faulty blower motor, you need to be vigilant as a homeowner. A damaged blower motor can lead to increased energy bills, uneven airflow, strange sounds, or worse, no airflow at all

In this section on “Signs of a Faulty Blower Motor,” I’ll discuss how you can spot these issues and what you need to do to address them

Increased Energy Bills

A defective blower motor in your HVAC system will cause a huge surge in electricity bills. That’s because the faulty motor needs more power to work, meaning it’ll consume more energy and bump up your bills.

If you spot an unexpected jump in your bills, it could be down to a faulty blower motor. But, you must watch out for other signs too such as reduced airflow and strange noises coming from the system.

Waiting to take care of the issue can be costly, it might cause more damage to your HVAC system and cause even higher bills. So, it’s vital to address any indications of blower motor issues quickly. This could involve repairing or replacing it.

One homeowner found that their electricity bills kept increasing over several months, despite efforts to save energy. After a comprehensive inspection of their HVAC system, they discovered that the blower motor was not running correctly and this was causing the big boost in power consumption. After replacing the faulty part, their energy bills returned to normal.

Uneven Airflow

The blower motor system circulates air in the car. If the flow of air is inconsistent or changes, it might be an issue with the blower motor. This makes it hard to regulate the temperature and affects the air quality.

It could be many things causing uneven airflow, so it’s best to get a mechanic. Weak air from one or more vents suggests a faulty blower motor resistor or a clogged air filter. It could also be a blockage in the ducts.

Winter makes it important to have the blower motor working correctly. According to Consumer Reports, faulty systems can lead to driver fatigue and dangerous driving. Address any issues quickly, before they become bigger problems. If your blower motor sounds bad, it’s time for a replacement.

Strange Sounds

The blower motor in your car can cause strange and unexpected noises. The sound you hear will depend on the problem with the motor. Don’t ignore these noises, they could lead to costly repairs.

High-pitched squeals or whines? That could be a loose or worn-out drive belt. A grinding noise? That indicates failing bearings. Clicking or ticking? That suggests an issue with the fan blades.

Pro Tip: Regular maintenance and inspections of your car’s HVAC system can help you avoid blower motor problems.

No Airflow

The blower motor is responsible for moving air around in your vehicle’s HVAC system. If it’s faulty, you may notice a lack of airflow. It could be due to many things, like a malfunctioning motor or a clogged air filter. It’s important to fix these issue quickly as it can be dangerous to drive without proper ventilation.

If air isn’t coming out of the vents, or you hear strange noises or weak airflow, it could mean the blower motor is faulty. It’s possible that a certain duct may be the problem, if only certain vents are affected. It’s best to have a professional take a look.

To see if the issue is the air filter, check it and replace it if needed. A dirty filter can limit airflow and cause strain on the motor. You may need to clean the fan blades, or get the motor replaced. It’s important to address this promptly for safety and comfort reasons.

Common Problems with Blower Motors


To identify common problems with blower motors and to find solutions for them, I would like to introduce some sub-sections, overheating, capacitor issues, damaged bearings, and electrical system problems

These are some of the most common issues with blower motors in HVAC systems that homeowners face. 

Overheating

Blower motors can suffer from high temperatures that cause major damage. This heat can lead to electrical issues like short circuits, melted wires and blown fuses. It can also cause the equipment to fail, posing a huge risk.

Overheating makes the motor less effective as the lubrication of the bearings and other parts evaporates. An overloaded motor or incorrect voltage may be to blame. Other causes include blocked or dirty air filters, poor insulation causing more friction, or continuous use without rest.

Regular maintenance can extend the motor’s life. Periodically check and clean air filters and make sure the unit has proper airflow. Professional inspection by an authorized technician can help diagnose any underlying problems.

In Florida during summer, the AC unit stopped blowing cold air in the afternoon. They called an electrician who first thought it was a refrigerant leak. It was actually a dirty air filter that made the blower motor overheat and shut off automatically. After changing the filter, it returned to normal quickly. 

Capacitor Issues

My friend’s blower motor’s capacitor was having certain issues. Age, or external factors, can cause it to deteriorate. This leads to starting and running problems.

Leaks and bulges are common signs of a failing capacitor. Leaks can cause electrical problems, while bulging indicates the capacitor has lived too long or has been overheated.

Capacitors store energy for the system and help the HVAC unit start up. But, if not checked and replaced when needed, failure risks increase.

Don’t ignore signs of a faulty capacitor. Like a constant humming noise or difficulty switching on the HVAC system. Take notice and contact an HVAC specialist before more serious damages occur.

I learned the value of regular maintenance checks when my friend’s HVAC failed at 3 am on a summer day in 2020. It was due to a failed capacitor. So, take heed of those strange noises coming from your blower motor, it could be warning you of damaged bearings.

Damaged Bearings

When the moving parts of the blower motor don’t turn properly, it’s called “Restricted Rotation”. This is often caused by worn-out bearings. These support the spinning parts and reduce the pressure or stress during use.

Worn-out bearings can create loud screeching noises. Or, rattling and shaking might mean they’ve become loose.

Bad bearings can also lead to decreased efficiency and airflow problems. They become misshapen and can’t provide warm air when needed.

Pro Tip: To avoid bearing-related issues, give your blower regular maintenance. Lubricate and replace bearings as needed. It’s best to keep electricity away from blower motors.

Electrical System Problems

When it comes to blower motors, the electrical system is essential for their working. But, there are some common challenges. A blown fuse or damaged wiring can lead to the motor not powering on or malfunctioning. An overheated motor can also cause problems with the electrical system.

Voltage fluctuations are usually caused by faulty resistors or relays. They must be functioning correctly as they manage the voltage flowing into the motor. Issues with these parts can make the motor get too little or too much power, which can lead to it burning out quickly.

It’s important to be aware of other unique issues too. A broken switch can stop power from reaching the motor even if everything else is okay.

My friend experienced this with his car’s fan blower. Smoke was coming from his dashboard, and after inspecting it, they found a short circuit in the wiring. It was eventually fixed, but with much effort and cost. Replacing a blower motor is like giving a new heartbeat to your car, but it won’t be brought back to life with a defibrillator.

Blower Motor Replacement


To replace a blower motor in your furnace, with various types available in the market, you need to determine when the motor needs a replacement. 

When to Replace a Blower Motor

Blower motors have a lifespan and must be changed when needed. But how do you know when it’s time to replace yours? 

Here’s a 4-step guide:

  1. Listen for odd sounds from the motor – Scratching tells that the bearings are worn. Grinding means they’re damaged.
  2. Test the airflow – Weak or no airflow means a replacement.
  3. Smell the vents – Musty odors could mean mold.
  4. Check for overheating and burnt wires – Smells and heat indicate a replacement.

If you notice any of these signs, contact a profrssional to replace the blower motor. 

Cost of Blower Motor Replacement

Replacing a blower motor can cost anywhere from $300 to $1000, depending on the quality of the part, the complexity of the motor, and labor costs. 

The national average for a blower motor replacement is around $450 for parts, plus $150–$200 in labor charges. But prices could be higher for certain makes and models, and dealerships usually charge more than independent mechanics or individual pros.

Regular maintenance is key to preventing sudden breakdowns and costly repairs. Change the air filters every three months, or as the manufacturer recommends.

A common blower motor issue is overheating, which usually requires replacement. Blower motors are subject to wear and tear over time, leading to poor air circulation. 

To help, try not to overuse them during peak weather periods.

DIY vs Professional Replacement

When it comes to replacing a blower motor, one must decide whether to DIY or hire a professional. 

Weigh up the pros and cons of each with regards to cost, skill level, time and safety.

FactorsDIY ReplacementProfessional Replacement
CostsAffordableExpensive
Skill LevelModerateExpertise
Safety HazardModerate RiskLow Risk

Despite the cost, professional repairs come with expertise, timely repair and warranty coverage. Plus they can identify underlying HVAC issues not visible through DIY methods.

A friend of mine once tried to DIY a blower motor replacement. He forgot the wiring steps and caused a malfunctioning airconditioner. It ended up being more costly and time consuming to undo the damage and fix it.

Steps for Replacing Blower Motor


To replace a blower motor yourself with the steps that I found after researching for a while, you’ll need to gather necessary tools and materials, turn off the power, remove the old motor, install a new motor, and test the blower motor. 

Gather Necessary Tools and Materials

It’s essential to get the stuff needed to replace the blower motor. 

Here’s a 4-step guide to help:

  1. Check the owner’s or service manual to see your car model’s requirements.
  2. Buy quality parts and tools from a reliable auto store.
  3. Tools you’ll need: screwdrivers, wrenches, sockets, pliers, and wire cutters.
  4. Wear safety gear like gloves, goggles, and masks when handling the motor.

Check if any extra stuff is needed for your car’s make and model. Cars are getting more advanced, with electronic systems requiring advanced diagnostic tools as well as conventional ones.

Replacing a blower motor has been around since cars. Technology has made it easier and more available than ever before. But remember, turn off the power before touching the motor, otherwise you’ll be like that squirrel who jumped on the power line.

Turn Off Power

Time to replace that pesky blower motor! To start the process, it’s essential to make sure power is disconnected. First, turn off the electricity supply connected to the furnace. Then, locate the circuit breaker panel and turn off any circuits powering up the furnace. 

If there isn’t a specific circuit, switch off all utility controls linked to heating or cooling appliances. As a final step, tape over the circuit breakers and switches so nobody accidentally turns them back on.

Be careful when dealing with electrical components and high-voltage supplies. The way to disconnect power from furnace units during service or repairs can vary depending on different models and manufacturers. 

Check their guidelines for the right precautions. In the case of older units, not following these measures could have serious effects, like electric shock or an uncontrolled fire outbreak.

Remove Old Motor

Time to switch up your car’s ventilation system

Here’s a step-by-step guide to removing the old blower motor:

  1. Disconnect all wires supplying power.
  2. Unscrew any nuts connecting the assembly and fan.
  3. Carefully remove the unit by pulling it out.
  4. Remove the fan from the shaft.
  5. Check for debris before installing new parts.

Also, press the tabs on either side of the electric plug and maneuver carefully for release.

The last time I worked on my car’s ventilation system, I had to remove an old blower motor. I didn’t pay enough attention when disconnecting the electric plugs, making it difficult to remove them later. I had to improvise a solution. It was then that I realized how important it is to be aware of details during repairs and maintenance tasks. Now, it’s time to fan the flames of success as you install the new blower motor.

Install New Motor

Time to check if the blower motor is working! If not, it’s time to swap it out for a new one.

First, take out the old motor. Disconnect the wires and remove any screws or bolts. Then, fit the new motor in and secure it with screws and bolts. Reconnect the wires. Make sure the new motor is compatible with the HVAC system and that it functions correctly. Safety first, so remember to take precautions when handling electrical components.

Replacing a blower motor can be tricky. Consider getting help from a professional. My friend attempted to replace his blower motor, but ended up breaking more parts than intended.

Take your time and follow each step carefully to avoid issues.

Test the Blower Motor

It’s essential to test your blower motor before use. This will help you decide if it needs replacing or repair. 

Here’s how:

  1. Locate the motor, usually under the dashboard on the passenger side.
  2. Unplug the electrical connector.
  3. Attach a multimeter to the two pins.
  4. Turn on the ignition and measure voltage. If there’s too little or none, the motor requires replacement/repair.

Be sure to unplug all attachments before testing, to avoid damages or accidents.

To keep your blower motor running, regular maintenance and cleaning is a must. Replacing air filters will reduce strain and improve efficiency. Stick to manufacturer guidelines when doing at-home maintenance.

Testing regularly can detect issues quickly, saving you from expensive repairs or replacements. Your vehicle’s cooling/heating system will provide a smoother experience and prevent discomfort in harsh weather. 

Maintenance and Care of Blower Motor


To ensure that your blower motor remains in top shape and your energy bills stay low, maintenance and care is key. 

A well-maintained blower motor will last longer, work more efficiently, and save you money on costly repairs and replacements. 

Regular Maintenance Tips

Regular upkeep practices are essential to keep your blower motor functioning efficiently. 

These best practices are known as Maintenance and Care Tips for Blower Motor.

  • Clean Regularly: Dirt and debris can impact airflow and cause power issues. Clean fan blades, housing and other parts often.
  • Check for Loose Parts: Vibrations could cause screws to loosen. Inspect all components.
  • Lubricate Moving Parts: Grease or dryness can cause noisy operations and performance instability. Lubricate with oils for stable runnage.

Verify maintenance activities at documented intervals. In addition, check electrical connections are secure. Reduce off-duty usage and avoid overloading machines during peak hours.

These suggestions will result in a reliable blower motor for longer periods. Take care of your equipment. 

Common Maintenance Issues

As a blower motor owner, it’s key to know the possible issues with its maintenance. Ignoring your blower motor can lead to pricey repairs or even replacements, bringing inconvenience and money loss in the long run.

Stay away from these disturbances:

  • Lack of lubrication
  • Clogging of air filters
  • Belt wear and tear
  • Blower wheel buildup
  • Electrical failures
  • Mechanical malfunctions due to aging or wear and tear

To dodge these problems, it’s vital to get regular check-ups from an experienced technician. Also, follow the blower motor manufacturer’s maintenance guidelines, especially if your unit is still under warranty.

Take note that proper care and maintenance of your blower motor can extend its life, increase efficiency, save energy, improve indoor air quality and bring comfort to your home.

Don’t wait till it’s too late and Schedule a professional check-up for your blower motor now to dodge expensive repairs or replacements in the future. When your blower motor starts to act up, it’s time to solve the case of the malfunctioning fan like a real detective.

Troubleshooting Tips for Blower Motor Problems

When tackling blower motor issues, there are tips to assist with the troubleshooting and diagnosing process. 

These can help you discover a solution without spending too much money on repairs.

  • Check if the blower motor is getting power from the electrical system. Use a voltmeter or multimeter to do this. If there’s no power, investigate the wiring or fuses.
  • Inspect the fan blades for any damage. Over time, these can become blocked with dirt, reducing the performance of the motor.
  • If nothing is working, a technician’s help is advised. They have the expertise and equipment to accurately diagnose and repair any issues.

Different vehicles require different maintenance and repair methods for their blower motors. Stick to the manufacturer’s instructions to ensure optimal performance. If you’re stuck, consult a professional. 

Conclusion


When it comes to a furnace’s blower motor, homeowners need to be aware of both efficiency and potential repair needs. A broken motor might cause energy bills to rise and the home to be uncomfortable. To prevent overheating and more damage, you should look out for signs of wear such as strange noises or less airflow. If you need to replace it, consider factors like the brand, model, and speed. In some cases, professional installation or repair may be necessary. Working with an HVAC technician can reduce the risks of harming the motor or yourself. To keep the motor functioning well, regularly change air filters and check for loose wires. Also, there are different types of motors on the market. I once had to repair my furnace motor. After listening to loud screeching, I discovered the old motor needed replacing. After researching and finding the model number, I bought a new one online. Using zip ties and screwdriver brackets, I was able to replace the motor at a lower cost than hiring someone. Although, others may prefer to let a professional handle the job.

About the author

Debarghya Roy: A heating systems author, Passionate about energy efficiency and sustainability, Sharing insights and empowering readers through informative blog articles.