Q: Electric Cooling Fan Remains On Even When Car is turned off

asked by on

Hello, I have a 2015 Toyota Yaris L Hatchback, after I got an oil change from the Toyota dealership the next day my car wouldn't start. The battery was drained, we bought a new battery and the next day it goes dead again. After jumpstarting the car we realized that the electric cooling fan remained on even when the car was turned off, remaining on for hours until it drained the battery. We checked the fuse for the cooling fan and there was no short, but the fan still keeps running. Is there any other issue that would prompt the fan to remain on? What could the problem be? Could it be a bad coolant temperature sensor? Or faulty relay? The dealership can't replicate the problem and can't fix anything because no trouble codes come up on their computers. Thank you for taking the time to answer my question- Paul V.

My car has 43000 miles.
My car has an automatic transmission.

The radiator fan will be controlled by the engine ECU (electronic control unit) through a relay. The relay is most likely your problem. When the fan shuts off, it can cause a small arc on the relay points that will weld them together and keep the relay and therefore the fan turned on. Replacing a fan relay is not a big deal and here is an article to help you through it. If you don’t want to try it yourself, contact Your Mechanic. They can send a technician to your home or office to replace your fan relay right there on the spot.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Electric Cooling Fan Remains On Even When Car is turned off

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: I want to install remote engine starter in my 2015 honda accord, What are the best options

Hi there. We typically stick to answering OEM service, repair and maintenance questions here on YourMechanic.com. Your best bet for this, since it's an aftermarket upgrade, is to seek out suggestions from a Honda performance expert or online forum with...

Q: BOTH AC FAN AND RADIATOR FAN NOT COMING ON

The problem you are describing likely stems from an electrical fault which would include things like a break in circuit wiring, bad grounds, relays, fuses, resistors, the fan motors themselves as well as the engine cooling temperature sensor. If engine...

Q: Car starts, but stalls while driving slow.

Hi There, It sounds like you may have a dirty or failing idle air control valve causing your engine idle to fluctuate. The idle air control valve is a small valve on the engine's intake system that reads the air...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.