Replaced Blower Motor And Resistor Still Not Working

The blower motor and resistor may not be the only components responsible for the fan’s operation. A thorough inspection by a trained technician can diagnose the issue accurately.

If your car’s ac or heater blower motor isn’t working even after replacing the blower motor and resistor, it can certainly be frustrating. Nevertheless, these are not the only parts that may cause the problem, as other components may lead to the issue. Unfortunately, you’ll need a trained technician to carry out a detailed inspection to determine where the problem lies.

It’s not advisable to wait too long, as it might lead to other issues, including damage to other parts of your car. An experienced technician can identify any issues and fix them immediately, allowing you to enjoy your car’s ac and heating without any problems.

Understanding Blower Motors And Resistors

Blower motors and resistors are essential components of an hvac (heating, ventilation, and air conditioning) system. The blower motor regulates the air’s flow and temperature by blowing air through the vents while the resistor controls the blower motor’s speed. In this blog, we’ll explore the purpose of blower motors and resistors in hvac systems, how they work together to regulate air flow and temperature, and common signs of their malfunction.

Explanation Of The Purpose Of Blower Motors And Resistors In Hvac Systems

Blower motors:

  • Move air through the hvac system and out of the vents
  • Control the system’s overall air circulation
  • Play a crucial role in the heating and cooling process


  • Regulate the speed of the blower motor
  • Help maintain the temperature balance by controlling airflow
  • Prevent the blower motor from overheating

How They Work Together To Regulate Air Flow And Temperature

Blower motors and resistors work together to regulate air flow and temperature in the following ways:

  • The thermostat signals the hvac system to start the heating or cooling process.
  • The blower motor engages and begins circulating air through the system’s ductwork.
  • The resistor moderates the speed of the blower motor, adjusting the temperature as required.
  • The blower motor then distributes the conditioned air through the vents and into the space.

This seamless collaboration between the blower motor and resistor ensures a consistent and comfortable indoor environment.

Common Signs Of A Malfunctioning Blower Motor Or Resistor

Malfunctioning blower motors or resistors may show tell-tale signs, including:

Blower motor:

  • Extremely poor airflow, which may lead to an overly hot or cold room
  • Unusual sounds coming from the hvac system
  • Burning smells indicating overheating of the blower motor


  • The hvac system may experience difficulty starting up or shutting down
  • The blower motor operates on only one speed regardless of the thermostat setting
  • The blower motor may run continuously, even if the thermostat is not calling for heating or cooling

Blower motors and resistors are essential components of an hvac system, working together to regulate air flow and temperature. If your hvac system shows any signs of malfunctioning blower motors or resistors, it’s best to seek professional help to fix the problem before it gets worse.

Steps To Diagnose The Problem

Is your car’s blower motor malfunctioning even after replacing it? This can be frustrating but don’t worry, we’ve got you covered! In this article, we will explain how to diagnose the problem and provide easy steps to test the blower motor and resistor.

Additionally, we’ve included some common mistakes to avoid during the diagnostic process.

Explanation Of How To Identify Which Component Is Malfunctioning

To identify which component is malfunctioning, follow these steps:

  • Turn on the blower motor to its highest setting.
  • Check if the blower motor is making any noise or if the air is blowing.
  • Turn on the air conditioning to identify if the problem is with the blower motor or the resistor.
  • If there is no noise but the air is blowing, there might be an issue with the resistor.

Explanation Of How To Test The Blower Motor And Resistor

To test the blower motor and resistor, follow the steps below:

  • Locate the blower motor under the dashboard and disconnect the electrical connector.
  • Use a voltmeter to check if the motor has power or not.
  • If there is no power, there might be an issue with the resistor.
  • To test the resistor, locate it under the dashboard and disconnect the electrical connector.
  • Use an ohmmeter to check the resistor’s resistance value and compare it with the specified value from the manufacturer’s guidelines.

Common Mistakes To Avoid During The Diagnostic Process

Here are some common mistakes that you need to avoid during the diagnostic process:

  • Not checking the fuse – it is essential to check the fuse before replacing any major components.
  • Skipping the diagnostic process – do not skip a thorough diagnostic process as it can save you time and money.
  • Not following the manufacturer’s guidelines – be sure to follow the manufacturer’s guidelines carefully to avoid any damage to the new components.
  • Not checking the wiring – always check if the wiring is in good condition or has any loose connections before replacing the blower motor or resistor.

By following the above steps and avoiding these common mistakes, you should be able to diagnose the problem with your car’s blower motor and resistor quickly and efficiently. Remember, regular maintenance can help avoid such problems in the future.

Heat Stopped Working In My Car! Blower Motor or Resistor?

Replacing The Blower Motor

If your car’s blower motor has stopped working, it may need to be replaced.

  • Turn off the car’s engine and remove the key from the ignition to ensure safety.
  • Open the car’s hood and locate the blower motor. Refer to the owner’s manual for its exact location.
  • Disconnect the negative battery cable, and remove the electrical connector from the motor by pulling it out of its socket.
  • Remove the retaining clips or screws that are securing the blower motor in place.
  • Carefully slide the motor out of its housing and disconnect any remaining wires or connectors.
  • Install the new motor in reverse order by connecting any necessary wires and affixing the retaining clips or screws.
  • Reconnect the negative battery cable and test the motor to ensure it is working correctly.

Recommended Tools And Materials

In order to replace a faulty blower motor, you will need the following tools and materials:

  • Socket and ratchet set
  • Screwdrivers (phillips and flathead)
  • Pliers
  • New blower motor
  • Retaining clips or screws

Tips To Ensure A Successful Replacement

To ensure a successful replacement of your blower motor, keep these tips in mind:

  • Always refer to the owner’s manual for specific instructions and safety precautions before attempting any repairs.
  • Wear protective gloves and goggles when working on your car to prevent injury.
  • Purchase a high-quality replacement blower motor to ensure durability and longevity.
  • Check the condition of the blower fan resistor, as this component commonly fails along with the motor and may need to be replaced.
  • Inspect the wiring and connectors of the blower motor to ensure they are not damaged or corroded, as this can cause the motor to malfunction.
  • Always test the new motor to ensure it is working correctly before finishing the installation.

Replacing The Resistor

Has your car’s blower motor stopped functioning despite replacing it with a new one? Don’t worry; it is not uncommon. In such scenarios, replacing the resistor could be the solution you need. The resistor helps to control the blower motor’s speed, and a faulty resistor could lead to the motor not working.

Here’s how you can replace the resistor in a few simple steps.

Step-By-Step Guide On How To Replace A Faulty Resistor

Follow these steps to replace the resistor:

  • Locate the resistor: you can find the resistor near the blower motor. Remove the bottom dashboard cover to access it.
  • Disconnect the electrical connections: remove the electrical connectors attached to the resistor to allow you to work on it.
  • Remove the retaining screws: use a screwdriver to remove the screws holding the resistor in place.
  • Pull the resistor out: once you have removed the retaining screws, gently pull the resistor out from its position.
  • Replace the old resistor with the new one: insert the new resistor into the slot and replace the screws to secure it in place.
  • Reconnect the electrical connections: reattach the electrical connectors that you earlier removed.
  • Test the blower motor: turn on your car and test the blower motor to ensure it’s working correctly.

Recommended Tools And Materials

Here are the recommended tools and materials you will require:

  • A screwdriver
  • A replacement resistor (ensure it is compatible with your vehicle’s make and model)

Tips To Ensure A Successful Replacement

Consider the following tips when replacing the resistor to ensure it’s successful:

  • Disconnect the battery: disconnect the car’s battery before working on the resistor to ensure your safety.
  • Follow the manual: consult the manufacturer’s manual for your vehicle to ensure you follow the correct steps to complete the replacement successfully.
  • Check for other faults: when you replace the resistor, check for any other faults which could affect the blower motor.
  • Seek professional help: if you find that you are not confident performing the replacement, seek assistance from a professional mechanic.

By following the above steps and keeping in mind the tips offered, you should be able to replace the resistor effectively and restore your car’s blower motor to working order.

Additional Troubleshooting Tips

If you have already replaced your blower motor and resistor but are still experiencing issues with your hvac system, there could be several causes to consider.

  • Blown fuse: check to see if there is a blown fuse in the system, as this will prevent the motor from receiving the power it needs to function.
  • Faulty relay: a faulty relay can cause problems with your hvac system, even after the motor and resistor have been replaced. If you suspect this is the case, test the relay and replace it if necessary.
  • Control module malfunction: if the control module isn’t working correctly, your hvac system may not respond to the settings you select. You’ll need to check the module and replace it if necessary.
  • Wiring issues: wiring issues can also interfere with the function of your blower motor. Double-check your wiring to make sure all connections are secure and that there are no frayed wires or other damage.

Additional Steps To Take To Diagnose And Address These Issues

If you’ve checked for the common issues above and are still having problems with your hvac system, there are a few additional steps to take to diagnose and address these issues:

  • Check the motor’s voltage: use a multimeter to check for voltage at the motor’s connector. If there is voltage but the motor isn’t running, the motor is likely defective and needs to be replaced.
  • Test the motor’s ground: if there is no voltage at the motor’s connector, check the ground. A poor ground connection can cause the motor to malfunction. Make sure the ground is clean, tight, and properly connected.
  • Examine the blower wheel: if the motor is running but there isn’t any airflow, the blower wheel may be broken or disconnected. Inspect the wheel for damage and replace it if necessary.
  • Take a look at the ductwork: if the motor and resistor are both functioning correctly, but you’re still not getting any airflow, the issue may be with the ductwork. Look for blockages or disconnected ducts that could be preventing the air from flowing as it should.

When To Seek Professional Help

If you’ve taken all of the steps above and still can’t get your hvac system to work correctly, it’s time to seek professional help. An experienced hvac technician can diagnose the issue and make the necessary repairs to get your system up and running again.

Don’t wait too long to seek help, as ongoing issues can lead to further damage and a larger repair bill.


After replacing the blower motor and resistor, it can be frustrating to discover that the issue wasn’t resolved. However, there are still some possible reasons why the blower still isn’t working. It could be a malfunctioning switch, a blown fuse, or a wiring issue.

It’s important to test these components before making any further assumptions. Additionally, it’s always recommended to seek the help of a professional mechanic or electrician to properly diagnose and fix the problem. Remember, safety should always be the top priority when dealing with electrical components.

We hope this article provided valuable insights and troubleshooting tips to help you address the issue with your blower motor and resistor. We wish you the best of luck in finding a solution to your problem.