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A/C fan surging


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23 replies to this topic

#1 OFFLINE   fazzman

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Posted 22 September 2014 - 08:01 AM

When a/c is on i can hear the interior blower fan increase and decrease in speed constantly. No matter what speed i have the system set to. Also get a ticking fan noise from inside the dash. Faint cricket type of sound. Under warranty still but just checking to see if anyone else has experienced this.







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#2 OFFLINE   FordService

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Posted 22 September 2014 - 10:35 AM

When a/c is on i can hear the interior blower fan increase and decrease in speed constantly. No matter what speed i have the system set to. Also get a ticking fan noise from inside the dash. Faint cricket type of sound. Under warranty still but just checking to see if anyone else has experienced this.

 

Hi fazzman,

 

I'm Crystal, the Ford Service rep on this forum. I'd recommend making an appointment for your dealer to check this out; don't forget to come back and post your results. What's your vehicle's model year and mileage?

 

Crystal


Edited by FordService, 22 September 2014 - 10:36 AM.


#3 OFFLINE   fazzman

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Posted 22 September 2014 - 11:24 AM

2013 SEL 31000 miles. Yes going to drop off this week sometime.

#4 OFFLINE   FordService

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Posted 22 September 2014 - 02:53 PM

2013 SEL 31000 miles. Yes going to drop off this week sometime.

 

Good deal, fazzman; I'll look forward to seeing how things go. If you need me to step in and assist after getting a diagnosis, just let me know. :)

 

Crystal



#5 OFFLINE   Russell Fried

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Posted 22 September 2014 - 09:08 PM

I have  the same issue. Doesn't really bother me. 2014 SEL. 3k miles. 



#6 OFFLINE   ScubaDadMiami

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Posted 22 September 2014 - 10:38 PM

It sounds to me like you have the A/C set to Auto. This will cause changes in fan speed. Switch to manual, and turn on recirculate, and then see what happens.



#7 OFFLINE   dtorres

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Posted 23 September 2014 - 10:34 AM

I have the same problem on my 2013 SE with 31,600 miles. This started about two months ago. I'm taking it in for the same thing today. Let us know what they find out. I'll post if they find a resolution.

#8 OFFLINE   fazzman

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Posted 24 September 2014 - 07:51 PM

Bringing mine in tomorrow morning. Not in auto mode. What bothers me the most is the fan cricket noise. Started about a week or so ago. Drives me crazy.

#9 OFFLINE   fazzman

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Posted 27 September 2014 - 03:05 PM

They didn't find anything. Of course. The ticking noise did go away on its own. The fan is still blowing odd.

#10 OFFLINE   Russell Fried

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Posted 28 September 2014 - 10:36 AM

Turning the AC off doesn't solve the problem. Im thinking its an issue with the electronics in the digital fan speed control. Probably a faulty control module. Some days its fine some days it surges all over.



#11 OFFLINE   bigalpha

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Posted 07 October 2014 - 12:10 PM

This happens to mine, too.  Seems like the fan blows at 85-90% most of the time but then randomly it will start blowing much harder.  And it's evident because the cabin gets louder and more air comes out.  Wish it blew at 100% all the time!

 

e: I should pull video from the dashcam when this happens.


Edited by bigalpha, 07 October 2014 - 12:12 PM.


#12 OFFLINE   kostby

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Posted 07 October 2014 - 02:20 PM

They didn't find anything. Of course. The ticking noise did go away on its own. The fan is still blowing odd.

In other cars I've owned, (usually without a cabin air filter) a ticking noise is usually due to some debris (insect, edge of a dried-out foam gasket, a maple 'helicopter' seed, leaf, or small twig, lodged somewhere near the fan and what you hear is the debris being struck repeatedly by the fan blades. In most cases, eventually it is struck enough times to dislodge, or it wears away enough that the ticking stops. Or you or the dealer disassemble things until you locate and remove it.

 

In one car, a clogged AC drain hose during hot humid weather to caused the bottom of the fan enclosure to fill with enough water to make a ticking sound. Then I turned a corner sharply and got a wet foot and the ticking stopped. That was when I discovered the clogged drain hose and cleared it.



#13 OFFLINE   kc1174

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Posted 04 January 2015 - 12:57 PM

Did anyone with this issue find a resolution? My 2013 SE does it too, and I took it in a few months ago, but the dealer said they couldn't replicate it (the standard response).

#14 OFFLINE   drdiesel1

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Posted 04 January 2015 - 01:14 PM

Did anyone with this issue find a resolution? My 2013 SE does it too, and I took it in a few months ago, but the dealer said they couldn't replicate it (the standard response).

What mode are you using ? Auto or Manual ? If it's in Auto mode when the issue occurs, try switching over to manual mode

and set the fan speed manually and see if that changes it. Auto mode will run the fan speed at different speeds based

on the load sensors input to the HVAC system.  You need to test the system in manual mode before running to the dealer.

 

If you can duplicate the issue in manual mode, then you have a problem. Otherwise, it's working as designed.


Edited by drdiesel1, 04 January 2015 - 01:15 PM.


#15 OFFLINE   kc1174

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Posted 04 January 2015 - 01:20 PM

What mode are you using ? Auto or Manual ? If it's in Auto mode when the issue occurs, try switching over to manual mode
and set the fan speed manually and see if that changes it. Auto mode will run the fan speed at different speeds based
on the load sensors input to the HVAC system. You need to test the system in manual mode before running to the dealer.


Thanks. Yep, I've tried both auto and manual and recirc and outside air. It's just randomly surging. Has been like this since day one in Jan 2013. At first I figured it was supposed to be like this, but I took it in and showed them but nothing happened. I may just try another dealer, but wanted to see if anyone with this issue had it resolved and what the resolution was.

#16 OFFLINE   drdiesel1

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Posted 04 January 2015 - 01:24 PM

Thanks. Yep, I've tried both auto and manual and recirc and outside air. It's just randomly surging. Has been like this since day one in Jan 2013. At first I figured it was supposed to be like this, but I took it in and showed them but nothing happened. I may just try another dealer, but wanted to see if anyone with this issue had it resolved and what the resolution was.

I would check my 12V battery. If the battery is low, this could be a result of the system trying to charge it. Low 12V system

power will cause all kinds of problems. Do you have a 12V battery charger ? You'll need a way to check voltage and SOC

on the 12V battery to know what's happening.



#17 OFFLINE   kc1174

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Posted 04 January 2015 - 01:41 PM

I would check my 12V battery. If the battery is low, this could be a result of the system trying to charge it. Low 12V system
power will cause all kinds of problems. Do you have a 12V battery charger ? You'll need a way to check voltage and SOC
on the 12V battery to know what's happening.

Thanks - Sorry, should have included some more info. I've been monitoring the 12v with my scangauge and seeing how the blower acts when other things are running (radio, lights, engine off/on, ice vs. hvb etc.). Also tried it without the cabin air filter but no change. Figure it's something to do with the blower motor, but not sure. I am one of those who had the 12v discharge issues, but that was fixed when I bought a new coolant pump and pigtail harness of my own and had Ford fit it for me, so that wasn't the issue.
Edit: Also bought a new 12v battery a few weeks after replacing the coolant pump, and am up to date on the multitude of recalls we've had. Just seems like the blower motor is bad.

Edited by kc1174, 04 January 2015 - 01:44 PM.


#18 OFFLINE   drdiesel1

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Posted 04 January 2015 - 01:47 PM

Thanks - Sorry, should have included some more info. I've been monitoring the 12v with my scangauge and seeing how the blower acts when other things are running (radio, lights, engine off/on, ice vs. hvb etc.). Also tried it without the cabin air filter but no change. Figure it's something to do with the blower motor, but not sure. I am one of those who had the 12v discharge issues, but that was fixed when I bought a new coolant pump and pigtail harness of my own and had Ford fit it for me, so that wasn't the issue.

So you're saying even with the car not running (accessory mode) HVAC on with the fan set manually (by pushing the fan speed button) the fan motor still surges ? If so, I would have the dealer check it,,,,,if you can duplicate the problem for them to see it. Show the tech not the S/A.  The tech will be the one working on it, so it's best to have them see it for themselves.


Edited by drdiesel1, 04 January 2015 - 01:47 PM.

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#19 OFFLINE   bigalpha

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Posted 04 January 2015 - 01:58 PM

I may just try another dealer, 

 

Do this immediately.  I stuck with one dealer while my warranty ran out.  After the warranty was out, Ford basically told me that I was on my own even though the issues were pre-existing and I had documentation on it.  



#20 OFFLINE   drdiesel1

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Posted 04 January 2015 - 02:02 PM

Here's a systems overview of the HVAC control.  It wouldn't be very hard to find out what the actual

fault is as long as it can be duplicated while the tech has the vehicle in the shop. Some quick voltage

drop testing and monitoring will pinpoint the COF.

 

I put red dots to indicate the main players in this diagram for the HVAC system.

Attached File  Untitled-1.jpg   93.74KB   5 downloads


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