Cooling Fan Runs 10 to 15 Minutes After Turning Off the Engine Even when It is Cold. - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
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post #1 of 5 (permalink) Old 01-04-2014, 03:43 PM Thread Starter
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Cooling Fan Runs 10 to 15 Minutes After Turning Off the Engine Even when It is Cold.

The cooling fan runs whenever the car is running. When I turn it off it continues to run for 10 to 15 minutes. This happens even when the coolant temp is very low. I just started the engine, ran it for a few minutes with my scanner attached. The coolant temp according to the scanner started at 32, and by the time I turned off the engine it was at 40. The fan continued to run for at least 10 minutes, and then shut off. My scanner did not read any codes. Where should I start looking?

I should also mention a couple of other issues that I have with the car even though I do not think they are related. The A/C does not get cold and the check airbag light is on.

I'd appreciate any help I can get. Thanks

Last edited by randyk; 01-05-2014 at 05:27 AM.
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post #2 of 5 (permalink) Old 01-06-2014, 06:49 AM
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I don't know all the facts about electric fans, but they turn on and off cycling air through the radiator to cool down the coolant fluid. I know the fans are supposed to stay on for a few minutes after you power down the vehicle to reduce engine temp.

Your thermostat is what I would point at. It contains a wax type pellet that moves up and down when engine temps change. It has no electrical circuits attached and will not throw any CEL's if the pellet is stuck in the open position (on). I have seen some pellets destroyed into a bunch of pieces. When its in the closed position, coolant will not flow and fan will be not turned on.

The SAS or airbag light may be stuck on the on position if a crash sensor is not functioning properly or has been damaged. You would want to take that in to the dealership soon for service. Or you can with your scan tool, look up BCM codes if its a sensor.

The a/c could be low on Freon which is common. Another could be the a/c compressor clutch can be stuck as well. When you turn on the a/c, turn off all accessories to hear the clutch engage between each mode (1,2,3,4, off), if you hear it make the "click sound" then the clutch is good and be sure to have a spotter look at the Y shaped clutch on the serptine belt, ensure the spotter sees it go from stop (off) to spin (on). More than likely, you should be just low on Freon if a/c blows warm, since cobalts don't have cabin air temp sensors. Just a front sensor for atmospheric air temp.

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post #3 of 5 (permalink) Old 01-12-2014, 06:39 AM Thread Starter
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Thanks for the advice. I will try the thermostat as soon as I get a chance to work on it.
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post #4 of 5 (permalink) Old 04-13-2014, 08:10 AM Thread Starter
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The issue with the cooling fan is finally resolved. I replaced the thermostat, but that did not help. It was worth a try.

I ended up taking it in to the dealer. It turns out that the fan was running because of an issue with the AC. Apparently there was a signal from the high side pressure sensor causing the fan to stay on. I had to have the compressor and sensor replaced. The car did have front end collision before I bought it. The dealership believes the AC system was damaged in the collision.

The check air bag light was caused by the front seat belt retractors which were also damaged in the collision.

It was expensive to have the dealership fix it all, but worth it to have all of the issues resolved properly.
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post #5 of 5 (permalink) Old 04-15-2014, 04:16 PM
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Hi RandyK,

We’re pleased to hear that your vehicle concern has been resolved. Chevrolet Customer Care is here if you ever have any other concerns with your Cobalt. We will be glad to look further into any question or concern you may have. Feel free to contact us via private message if needed.

Kristen A.
Chevrolet Customer Care

Have you checked into Chevrolet Owner Center? You can maintain service history, check on warranty or recall information, and more. Visit my.chevrolet.com!
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