Skip the auto shop - Our mechanics make house calls

Symptoms of a Bad or Failing Blower Motor Switch

Blower Motor Switch

The blower motor is the electrical switch on the interior of a vehicle that allows the driver to control the vehicle’s heating and air conditioning system. It is usually built into the the same control panel that houses all of the AC system controls, and is labeled with numbers and symbols to indicate blower fan speed.

Since the blower motor switch is the direct control for the blower motor speed, when it malfunctions or has any problems it can affect the functionality of the entire AC system and should be serviced. Usually, when the blower motor switch has failed or is beginning to have a problem, the vehicle will display a few symptoms that can alert the driver that a problem has occurred.

1. Switch only works on certain settings

One of the first symptoms commonly associated with a bad or failing blower motor switch is a switch that only works on certain settings. If any of the electrical contacts on the inside of the switch wears out or breaks, then the switch may be disabled in that position and that particular setting for the blower speed will not work.

2. Switch is stuck

Another symptom of a bad or failing blower motor switch is a switch that is stuck, or frequently gets stuck. If the switch or any of its contacts becomes damaged, this may cause the switch to jam, or get stuck when you trying to change the setting. In some cases, the switch may completely seize into one position, which will lock the AC into place.

3. Broken knob

A symptom that is a bit more obvious is a broken knob. It is not uncommon for the knobs on the blower motor switch to break or crack, as they are usually made out of plastic. If the knob breaks, the switch may still work, however, it may be difficult or impossible to change positions on the switch if it is broken. Usually when this happens, only the plastic knob needs to be replaced, not the entire switch.

The blower motor switch is the physical control switch for the AC blower settings, and is therefore critical to the overall functionality of the AC system. For this reason, if you suspect that your blower motor switch has a problem or fault, have the vehicle’s AC system diagnosed by a professional technician, such as one from YourMechanic. They will be able to replace the blower motor switch or make any other repairs that are appropriate.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.


Post a question and get free advice from our certified mechanics.


More related articles

How to Transfer a Car Title in Idaho
In order to prove ownership of a car, you must have the title. However, when a car is sold, given away or inherited, the title needs...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
The Traveler’s Guide to Driving in Malaysia
CraigBurrows / Malaysia is a popular destination for many tourists today. The country has amazing sights and attractions that you will want to explore....

Related questions

Q: Engine making weird noises.

Seeking a mechanics advice when car issues come up is always a good idea. Especially when it comes to engine noises. Since I don't know what kind of noise you are hearing, I will try to explain what is important...

Q: How do I turn on the parking lights?

The parking lights are controlled by the light switch, which is on the turn signal lever, which protrudes from the left side of the steering column. To turn on the parking lights, rotate the light switch into the parking light...

Q: Engine comparment smell coming from air blower vents

Hi there, thanks for writing in. It's very possible that you have either a fuel leak under the hood of your Suzuki or perhaps a leak from your EGR valve. The EGR valve circulates unburnt fuel from the exhaust manifold...