Skip the auto shop - Our mechanics make house calls

Q: Fan blower stopped working

asked by on

When I purchased the vehicle used in January of 2015 the fan was working on all settings (heat and AC). It has a weak air flow but not much. Now for the last two weeks the fan speed has been decreasing and then it would abruptly shut off completely on every setting. Three days ago it stopped working all together. I replaced the blower motor resistor and checked the fuse. No luck. What could the problem be?

My car has 160000 miles.
My car has an automatic transmission.

Hi, thanks for writing in. I’d be happy to provide my insight. There are a few other possibilities with this scenario. The blower switch, the blower motor itself, function switch or the blower fan relay could have a problem. What you are experiencing is a high resistance somewhere in the blower circuit. It is the same thing your blower motor resistor does.

You can tap on the blower motor with a small hammer to see if it responds by beginning to work or if it changes speed. This is a very good diagnostic method for electric motors.

There are two possible systems with your car. One has a blower motor relay, and the other does not. If yours has a blower motor relay, this can serve as a good place to do some testing. Testing will require a test light, possibly a multimeter and access to a quality wiring diagram for your car. You will need to understand how electricity works as well.

If you would like help, consider having an expert automotive technician from YourMechanic come to your home or office to inspect and diagnose this issue for you, and make or suggest any repairs as needed.

Good luck!

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Running rough at idle

When an engine runs rough at idle only it is most likely caused by a vacuum leak in the intake manifold gasket or the intake manifold runner control is stuck in the wrong position for closed throttle. Have a mechanic...

Q: Car running really rough

Hi There, If you have tested and checked all coil packs and spark plugs with everything checking out properly, it may be likely that your issue is related to fuel delivery such as low fuel pressure or potentially a dirty...

Q: Struggles to start, interior blowers turn on by them selves and central locking issues

Hello. From what you describe it would appear that your vehicle is experiencing a few different issues. Intermittent hard starting can be caused by many things. If nothing is happening when you turn the key, then it is possible that...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...