Buick Verano AC blower motor not working – causes and diagnosis

The blower motor is the central component of the air conditioning system in Buick Verano, responsible for blowing hot or cold air through the AC vents. If the blower motor stops working due to a fault, the air will not flow out of the vents when you switch on the AC in your Verano.

Buick Verano
Buick Verano – (IFCAR / Wikipedia)

The most common causes for AC fan blower motor not working in Buick Verano are blown fuse, bad relay, resistor or control module malfunction and faulty blower motor. However, a bad electrical connector or broken wire, or a defect in the climate control unit can also cause the blower motor to stop working.

1. Blown fuse

The AC blower motor in Buick Verano needs electricity to work. In case of a faulty fuse, the circuit is interrupted and the motor can not work.

Check the owners manual of your Verano or the fuse box cover to find the exact location of the fuse for the blower motor. If the fuse is blown, replace it with a new one with the specified amp rating.

To check the fuse, pull it out of the fuse box using a fuse puller or needle nose plier and hold it against the light. If the metal strip is broken in the middle, the fuse has blown. You must replace it with one of the same amperage and therefore the same color. It does not matter in which direction you insert the fuse.

2. Bad relay

Relays are electromagnetic switches that are used to switch electrical loads on and off. A bad relay can also be the cause of AC blower motor failure in your Buick Verano.

First of all, you should find out where the blower motor relay is located in your particular model of Verano. The information may be listed in your vehicle’s owners manual. Typically relays are located in the engine compartment or under the steering wheel on the left-hand side. If you are lucky, the wiring diagram will be drawn on the facing. You can test the relay by swapping it with other relays in the fuse box with similar amp rating. But before you begin the replacement, it is highly recommended to disconnect the vehicle’s battery.

Note: Vehicles with auto climate control may not have a blower motor relay.

3. Bad resistor or control module

The function of the blower motor resistor is to control the speed of the blower motor. When you increase or decrease the AC fan speed in your Verano, the climate control unit signals the resistor module to increase or decrease the flow of electric current to the blower motor. If the resistor module develops a fault, it can cause the blower motor to stop working.

The resistor is typically located under the passenger side dashboard, near the blower motor.

What causes blower motor resistor to fail in Verano?

A struggling blower motor due to internal component degradation can put a lot of strain on the resistor when in operation, causing it to overheat and burnout. Therefore it is generally recommended to replace the old blower motor in Verano as well when replacing the resistor.

Will a blower motor work if the resistor is bad?

Yes, the blower motor can still be operative after the resistor goes bad, but it may only work at high speed, or remain stuck at one fan speed. However, if the resistor has burned out due to overheating, the blower motor may cease to function.

Testing the blower motor resistor

There are many ways to test a resistor, but the most easiest and basic method is to check the voltage at the electrical connector on the blower motor with a multimeter. Follow this procedure after you’ve ruled out any problem with the blower motor fuse or relay.

  1. Locate the blower motor in your Verano, typically located under the passenger side dashboard.
  2. Remove the electrical connector from the blower motor.
  3. Turn on the multimeter and insert the probes into the connector, one at each point making sure the metal part of probes don’t touch each other – otherwise it will short out and blow up the fuse, and may cause damage to the vehicle’s electrical system.
  4. Turn on the AC fan in your Verano.
  5. The output voltage on the multimeter should read around 12 volts.
  6. If you do not see any volts, or if you only see volts at certain fan speed setting, it could be due to a bad resistor.
  7. If the volts reading is normal, then the fault probably lies with the blower motor itself.
The most basic multimeter voltage test to check if the blower motor is getting any current. You can also use a test light for this purpose.

4. Faulty blower motor

When you turn on the AC fan in your Verano, and the air does not flow out of the vents, or the airflow is poor or inconsistent, it could be due to a broken blower motor.

Early signs of blower motor failure

Blower motors can fail at any time without warning, but usually there are early signs before they stop working. The most common signs of failing blower motor in Buick Verano are unusual whirring noises coming from behind the dashboard when air conditioner is in operation, weak or inconsistent airflow, and in rare cases a burning plastic odor or smoke coming from AC vents especially when fan speed is set to high.

How to test the blower motor

  1. Unplug the electrical connector from the blower motor.
  2. Turn on the multimeter and insert the probes into the connector, one at each point making sure the metal part of probes don’t touch each other.
    Note: You can also use a test light.
  3. Turn on the AC fan in your Verano.
  4. The output voltage on the multimeter should read around 12 volts.
  5. If the volts reading is normal, it indicates a fault in the blower motor.

The more accurate way to test if the blower motor is bad in Buick Verano is to connect it directly to a 12 volt battery using alligator clip test cable. If the motor does not spin after directly connecting to the battery, it confirms that the blower motor is dead and should be replaced with a new one.

How long do AC blower motors last?

The AC blower motor is not part of the regular maintenance on Verano, you replace it when it dies. Blower motors are maintenance-free and can easily last for over 10 years, but they can fail earlier due to overheating, moisture damage or manufacturing defect. Also, over time the bearings of the blower motor can lose their initial lubrication and begin to dry out, causing increased friction in the motor. When this happens, you may hear unusual whirring or droning noises from behind the dashboard.

5. Bad connector or broken wire

A bad connector on the blower motor or the resistor module, or on the climate control unit can interrupt power supply to the blower motor in Verano. Additionally, a damaged wire in the circuit, including the wire from the fuse box, can also cause the blower motor to stop working.

Rodent damage

Rodents, such as rats or mice, can get under the hood or even make their way inside the dashboard of your Verano and chew on wire coatings, which can cause all sorts of electrical problems. If bite marks are discovered, carefully examine all the cables and hoses for damage, including electrical wires for the blower motor.

Martens cause millions of dollars of car damage every year.

6. Defective climate control unit

Climate control module is the brain of the air-conditioning system in your Buick Verano, also responsible for turning on and controlling the speed of the blower motor. In rare cases, a fault in the climate control unit can cause the blower motor to stop functioning properly.


There are many reasons why the AC blower motor may not be working in your Buick Verano. When looking for the reason, you should always start with the most obvious cause, blown fuse or faulty relay.

In any case, it is advisable for laypersons to visit a workshop as you can easily do more damage to your vehicle, especially to the electrical system. A professional mechanic can swiftly diagnose the issue for you.

Author: Nabeel K
Email: nabeel@wheelsjoint.com

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1 month ago

Hi, I was reading your article on the blower motor not working for the Verano. My daughters 2013 has issues. Sometimes it will not come on. No ryme or reason. Other times is comes on and blows cold. Same with the heat. Sometimes no heat. Randomly, while driving it will come on. Like she might hit the gas hard andit is like the jolt and agressivness of the car speeding, get it to work, and it has turned the A/C on, or the other day, it was not working, and she turned onto a street and while in the turn it turned on. She had a mobile mechanic come look, but it was working at the time, so he could not really troubleshoot it since it was working, so he replaced the restistor, since when he moved the fan speed button high and low, he saw some odd reactions. That didn’t fix it. It still doesn’t come on at times. She says she can feel the cold air in the vent but it just isn’t blowing out.

Do you have any idea what it might be? She took it to a mechanic yesterday and of course it was working and they could not replicate it, but they said they tested the blower motor and it worked fine. I am thinking there is an interminent connection issue with the controller and the blower. Since the resistor was replaced and the blower tested ok, do you have an trouble shooting steps you would do in this situation that you could share with me?