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Erratic A/C Fan Operation


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3 replies to this topic

#1 OFFLINE   tyczkowski

tyczkowski

    New Flex Member

  • Ford Flex Members
  • 2 posts
  • Location:FL
  • Current Vehicle:2010 Ford Flex Limited

Posted 09 April 2012 - 11:26 AM

We have a 2010 Flex Limited. Recently, the air conditioning fan randomly toggles at different speeds no matter if the A/C is in Auto or Manual mode. This erratic operation comes and goes. The Ford garage is telling me that this is normal operation. That's bull! I have 26,000 miles on the vehicle and have had this problem only the last month, approximately 2,000 miles of driving. The other thing is that shortly before it started, there was a burning smell, like a burned up or overheated electrical component. My feelings are that the A/C system runs via an electronic module, and that something on it got fried or stressed. But I keep getting the story of "normal operation"! Help!

#2 OFFLINE   mmsstar

mmsstar

    New Flex Member

  • Ford Flex Members
  • 278 posts
  • Region:Decline
  • Location:Mike in Cleveland Area
  • Current Vehicle:2011 SE

Posted 14 April 2012 - 06:20 AM

You might try enlisting the help of Cory from Ford customer service who hangs out here from time to time

http://fordflexforum...ustomerservice/

Edited by mmsstar, 14 April 2012 - 06:22 AM.


#3 OFFLINE   Midnight Rider

Midnight Rider

    New Flex Member

  • Ford Flex Members
  • 68 posts
  • Location:CT
  • Current Vehicle:2010 Flex

Posted 14 April 2012 - 08:18 PM

There is a blower motor speed control module in the bottom of the heater/AC plenum. That may have been damaged. It is controlled by another module, the HVAC module. There is only the feed wire, ground wire, motor wire, and control wire (from the HAVC) going to the speed module, so I assume it's an electronic gizmo, and not the old style resistor-wire unit.
Troubleshooting them could be a challenge.
The speed is also controlled by the heating or cooling needs of the car at the moment. It's possible the sensor is bad. You could try taking manual control of the fan speed, which would bypass that sensor.

#4 OFFLINE   Planedriver_1

Planedriver_1

    New Flex Member

  • Ford Flex Members
  • 17 posts

Posted 08 April 2014 - 10:48 AM

Interesting, my flex is over 5 Years old the hvac fan in the front was acting up,
it would just not run sometimes. A bang on the kick panel or dash would get it
running again some days it would work fine. Research says if the electronic
reostat failed the fan would default to high speed and lower speed would not
be controlled, so I figured the fan motor was tired and well used up, it's been
running pretty much for 85 thousand miles, I got a ford part through the dealership
installed the new one. All great no stoppage runs every time. The only thing to me
now is the amount of air it is discharging seems much less than the original
was. Back in the early years of the 09 flex complaints about warm cabins especially
out west and Florida were common a bulletin was out for a fix. I did bring it in
But was completely unsure of what was done. Today I believe it may have included
a computer adjustment and perhaps a faster speed fan motor, reason I think this
is the case when tearing into my issue I see evidence of sloppy workmanship and
damage to my dash only seen if you were to work in this area, 4 years later I am
and what do you know. Looks just like someone was into the dash there.

Can anyone shed light on the air conditioning problem from back in 09/10 that
would know if I got some new part incorrect for my flex because of years gone
and the one they may have replaced was increased in capacity to help us with
a cooling problem. If this the case I need a different part number.

Thanks planedriver


Interesting, my flex is over 5 Years old the hvac fan in the front was acting up,
it would just not run sometimes. A bang on the kick panel or dash would get it
running again some days it would work fine. Research says if the electronic
reostat failed the fan would default to ugh speed and lower speed would not
be controlled, so I figured the fan motor was tired and well used up, it's been
running pretty much for 85 thousand miles, I got a ford part through the dealership
installed the new one. All great no stoppage runs every time. The only thing to me
now is the amount of air it is discharging seems much less than the original
was. Back in the early years of the 09 flex complaints about warm cabins especially
out west and Florida were common a bulletin was out for a fix. I did bring it in
But was completely unsure of what was done. Today I believe it may have included
a computer adjustment and perhaps a faster speed fan motor, reason I think this
is the case when tearing into my issue I see evidence of sloppy workmanship and
damage to my dash only seen if you were to work in this area, 4 years later I am
and what do you know. Looks just like someone was into the dash there.

Can anyone shed light on the air conditioning problem from back in 09/10 that
would know if I got some new part incorrect for my flex because of years gone
and the one they may have replaced was increased in capacity to help us with
a cooling problem. If this the case I need a different part number.

Thanks planedriver

Edited by Planedriver_1, 08 April 2014 - 10:50 AM.







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