Skip the auto shop - Our mechanics make house calls

Q: Fan not kicking on

asked by on

Hello I have a 2014 chevy sonic with the 1.8 ecotech my gf was sitting in a parking lot with the ac on then it turned warm and the Temp light came on she shut it down and let it cool down then got it home. When I got home I found the coolant low so I topped it off and let it run. Fan never kicked on with ac running. I checked power to the fan found 15.4 v I also used a power probe to power fan and it kicked on. The fans connecter has a dropping resister on it I'm not sure if that could be faulty not allowing voltage to it? I also put new fan speed solenoids to eliminate those. Does this fan operate like others when ac builds enough head pressure does it kick the fan on? Are there any common cooling issues with these cars? I'm a mechanic myself by trade but not familiar with these cars. Any help is appreciated thanks in advance.

My car has 60000 miles.
My car has an automatic transmission.

Hi there. On these modern cars, the radiator fan is activated when the coolant temperature sensor on top of the radiator detects that the coolant has reached a predetermined temperature. This sensor is commonly one of the first components of the cooling system to fail. It’s also common for excessive debris to cause the electrical harness connected to this sensor to fail as well. This video is actually very good to review that will explain what I’m talking about.

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

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!

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: My car does not start anymore when the gas is lower than 10 liters

Hi there; In a 98 Corolla, I wouldn't be too certain that the ECU is the source of the lack of fuel pressure. It could be an electrical relay problem, an obstruction inside the fuel line or the fuel pump...

Q: Oil change due, now car is bouncing and shaking

Hello. The oil change should not cause the car to bounce or shake. This may be unrelated to the oil change and may be a sign of a more serious problem and should be looked at by a qualified mechanic...

Q: Battery is not charging properly

This may be a sign of a weak battery, a failing voltage regulator or failing alternator. The alternator is responsible for charging the battery while the engine runs by generating amperage and recharging the battery while the engine turns the...

Related articles

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...
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...
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.