Symptoms of a Bad or Failing Heater Blower 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.


Next Step

Schedule Vehicle Engine Cooling Inspection

The most popular service booked by readers of this article is Vehicle Engine Cooling Inspection. Once the problem has been diagnosed, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. YourMechanic’s technicians bring the dealership to you by performing this job at your home or office 7-days a week between 7AM-9PM. We currently cover over 2,000 cities and have 100k+ 5-star reviews... LEARN MORE

SEE PRICING & SCHEDULING

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

Recent Vehicle Engine Cooling Inspection reviews

Excellent Rating


YourMechanic Vehicle Engine Cooling Inspection Service

Average Rating

4.9/5

Number of Reviews

141,457

Rating Summary
132,330
5,037
1,008
715
2,367
132,330
5,037
1,008
715
2,367

Jerome

23 years of experience
415 reviews
Jerome
23 years of experience
Nissan Altima - Electric Problems - Baltimore, Maryland
Great mechanic who knows what he’s doing. Highly recommended

Jeshua

6 years of experience
125 reviews
Jeshua
6 years of experience
Nissan Cube - Car is not starting - Longboat Key, Florida
He was very friendly and knew what he was doing. We will always request Jeshua with anything else, bad or good, with our cars. Hopefully, not really bad! He was a pleasure.

Omar

11 years of experience
280 reviews
Omar
11 years of experience
Jeep Wrangler - Car is not shifting into park - Weston, Florida
Very Good he was early explained everything to me . Was very professional.

Jeffrey

26 years of experience
870 reviews
Jeffrey
26 years of experience
Honda Accord - Timing Belt - Charlotte, North Carolina
Arrived early, finished early and did a great job!

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

Related articles

How to Diagnose a Broken Car Heater
A working car heater will keep you warm and defrost your car. A failing radiator, thermostat, or heater core can cause your heating system to fail.
How Long Does a Heater Bypass Tube Last?
In In order for the cooling system on your vehicle to work, you will have to make sure that all of its components are repair free. The thermostat that is on your vehicle helps to regulate the flow of coolant...
Why Does My AC Rattle When I Turn It On?
Common reasons why a car AC system makes a rattling noise is due to a failing AC compressor, worn serpentine belt, or worn out AC compressor clutch.

Related questions

HVAC actuators not working properly

There are quite a few issues reported with the blend door actuator behind the glovebox being problematic. Other possibilities include a faulty BCM (Body Control Module) or damaged HVAC harness. Before having any parts replaced, you may want to enlist...

My heat and AC do not work - 2003 Volkswagen Beetle

It sounds like the blend door may be stuck. The blend door is usually controlled by a cable or an actuator. If the switch itself seems to be hard to turn, it is likely cable driven and experiencing a restriction....

How do I set the temperature to synchronized mode?

When your vehicle is in synchronized mode, then the temperature settings will remain the same for both the driver and the front passenger. To turn on synchronized mode, press the SYNC button, then control the temperature settings with the driver’s...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com