Cooling Fan - Ford Mustang Forum
 
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post #1 of 10 (permalink) Old 02-26-2019 Thread Starter
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Cooling Fan

I just bought a 2015 GT. I noticed the cooling fans come on withing a minute or two of starting the motor, when the engine isn't hot....then they seem to stay on. motor never gets hot, but don't know why they won't turn off? any ideas??

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post #2 of 10 (permalink) Old 03-01-2019
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I would check if the engine coolant temp sensor is defective or disconnected.

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post #3 of 10 (permalink) Old 03-01-2019
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Assuming you already checked the sensor like Lime1 suggested --

Did the prior owner mess with the tune by any chance? There is a "fan on temperature" setting in the tune, that can be changed; and some people reduce this temperature because they want the fan to come on early to keep the engine very cool, for racing applications. Actually I think there are two settings, "low fan" and "high speed fan" or something like that.

The fan will come on when the temperature goes above that setting; so if that setting is really low, then the fan will come on when the engine is not very hot. I am not sure what is the minimum setting allowed.

If you got a tuner with the car, you can check it there.

| 2010 GT coupe | Daily Driver with some Steeda and GT500 take-off stuff for the occasional track day
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post #4 of 10 (permalink) Old 03-01-2019
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The electric cooling fans are controlled by a temperature sensor. I'd bet your temp sensor in the block/wherever is shorted making the fans think the engine is hot. I'd try disconnecting the sensor to see if the fans still turn on.
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post #5 of 10 (permalink) Old 03-02-2019
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Is the air conditioning turned on-either AC on or defrost on?
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post #6 of 10 (permalink) Old 03-04-2019
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^^^ good point, that will make the fans come on right away, right?

haven't heard back from tim96 for a while . . .

| 2010 GT coupe | Daily Driver with some Steeda and GT500 take-off stuff for the occasional track day
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post #7 of 10 (permalink) Old 03-06-2019 Thread Starter
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Hey guys, man, I forgot about this thread.....LOTS of good ideas, no the AC or Heater isn't on.....right after I posted this someone said check the relay's, so I did that, swapped them with another on that I knew worked (I used the wiper one), and the first time I drove it, didn't come on......it's been snowy here in STL, so I haven't driven it, but got it out today, and fan came on right away. I guess I'll check the temp sensor.....where is it off hand? I haven't looked yet....but didn't know if it was easy to find. I'll see if something wasn't done to the tune. That I do not know, I bought it from a dealership, and they didn't say, nor did I ask.

One thing that seems weird that is unrelated (I guess), the "screen" that says what your average MPG is for the last 30 minutes, when the car shuts off, the last 30 minutes is erased.....Is that normal? My truck has the same thing, but it remembers what the readings were when it shuts off....weird. That' doesn't bug me, as I don't look at that screen, but makes me wonder if something in the computer is off?? Everything else seems to work, only have an issue with the fan, and that.
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post #8 of 10 (permalink) Old 03-06-2019
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Quote:
Originally Posted by JBert View Post
^^^ good point, that will make the fans come on right away, right?
Yes, as the windshield defog automatically turns on the AC. When the AC is running, the fan is running.
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post #9 of 10 (permalink) Old 3 Weeks Ago
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Quote:
Originally Posted by tim96 View Post
Hey guys, man, I forgot about this thread.....LOTS of good ideas, no the AC or Heater isn't on.....right after I posted this someone said check the relay's, so I did that, swapped them with another on that I knew worked (I used the wiper one), and the first time I drove it, didn't come on......it's been snowy here in STL, so I haven't driven it, but got it out today, and fan came on right away. I guess I'll check the temp sensor.....where is it off hand? I
haven't looked yet....but didn't know if it was easy to find. I'll see if something wasn't done to the tune. That I do not know, I bought it from a dealership, and they didn't say, nor did I ask.

One thing that seems weird that is unrelated (I guess), the "screen" that says what your average MPG is for the last 30 minutes, when the car shuts off, the last 30 minutes is erased.....Is that normal? My truck has the same thing, but it remembers what the readings were when it shuts off....weird. That' doesn't bug me, as I don't look at that screen, but makes me wonder if something in the computer is off?? Everything else seems to work, only have an issue with the fan, and that.
The sensor is on the block near the transmission behind the rh. Cyl. Head. I wouldn't unplug it though. If your car has the selectable gauges, watch the cylinder head temperature. See if it seems reliable. They do go bad,but it usually makes the warning lights come on
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post #10 of 10 (permalink) Old 3 Weeks Ago
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Good luck with it!
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