Skip the auto shop - Our mechanics make house calls
  1. Home
  2. Articles
  3. Symptoms of a Bad or Failing Heater Blower Motor

Symptoms of a Bad or Failing Heater Blower Motor

blower heater motor

Virtually all road going vehicles are equipped with a heating and air conditioning system that is designed to help keep the vehicle’s passengers comfortable. One of the components of that system is the heater blower motor. The blower motor serves as the main electric motor that is responsible for blowing air through the vents. It is usually controlled by the blower motor resistor and switch, and can operate at several different speeds to help regulate cabin temperatures.

When the heater blower motor fails, the vehicle can be left without a properly functioning heating and air conditioning system, which apart from compromising comfort, can also disable useful functions such as the window defogger. Usually a bad or failing heater blower motor will produce a few symptoms that can alert the driver of a potential issue.

1. Weak airflow from the vents

One of the first symptoms of a potential problem with the vehicle’s heater blower motor is low airflow from the vents. If when the air or heat is turned on the vents blower noticeably less, or weaker air, that may be a sign that the heater blower motor is starting to wear out. A worn or weakened blower motor may not be able to provide adequate airflow to properly regulate the cabin temperature, and may also be approaching the end of its service life.

2. Fan only blows at certain speeds

Another symptom of a bad or failing heater blower motor is a motor that only functions at certain speeds. Most blower motors are designed to operate at different speeds in order to be able to regulate different cabin temperatures efficiently. If the blower motor fails to push air at any of it’s designed settings then it may be faulty. This can also be caused by a failed blower motor resistor or switch, so having the vehicle properly diagnosed is highly recommended.

3. No air from the vents

No air flow from the vents when the heater or air conditioning is activated is another symptom of a bad blower motor. If the heater blower motor burns out or short circuits, it will not function, and therefore will not be able to produce any airflow for the system. The blower motor will usually have to be replaced in order to restore proper operation to the system.

A faulty blower motor can disable an otherwise fully functional heating and air conditioning system, which will make the driving experience less comfortable for the vehicle’s passengers. Failed blower motors often require taking apart the vehicle’s interior, so if you suspect that your vehicle’s blower motor may be having an issue, have the vehicle inspected by a professional technician, such as one from YourMechanic, to determine if the motor should be replaced.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Still not sure about your car's issue?
Diagnose your car
What kind of issue are you experiencing?
Brakes are squeaking
Car is not starting
Car is overheating
Car is shaking (vibrating)
Fluids are leaking
Heating and A/C
Smoke or steam is coming out of the car
Warning light is on
Icon-warranty_badge-02

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

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.

GET A QUOTE

More related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
P0222 OBD-II Trouble Code: Throttle/Pedal Position Switch/Sensor B Circuit Low Input
P0222 code definition Throttle/Pedal Position Switch/Sensor B Circuit Low Input What the P0222...
How to Buy Fuel Treatments
Adding a fuel additive to your gas tank when you fill up is one way to clean vital engine parts of deposits, improve the performance of your engine,...


Related questions

Q: heater blowing cold air most of the time, possible coolant leak

A few different items can cause the heat to be intermittent. An air bubble in the cooling system, low coolant, a heater core failure, a coolant leak, and an AC actuator can all cause the heat to go in and...

Q: AC not working

While there could be a variety of different reasons as to why your air conditioner is not blowing cold in your Mustang as it should be, the most common problem is low refrigerant. Unfortunately just topping off the radiator with...

Q: A/C compressor clutch does not engage, cooling fan does not turn on, condenser fan does not turn on, and ceiling light does not turn on.

Hi there. The air conditioning clutch could be not working for the refrigerant could be low or the clutch could be burned up. Check the air conditioning compressor clutch wiring for a voltage with the a/c switch on high and...