Fan Clutch duty cycle using AE - Ford Powerstroke Diesel Forum
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Old 09-09-2013, 10:58 AM
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Fan Clutch duty cycle using AE

Moved thread to here:

Fan Clutch duty cycle using AE

Last edited by pedaltek; 09-09-2013 at 04:54 PM. Reason: Switch forum
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Old 09-09-2013, 03:19 PM
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From what you describe you have a fan clutch issue. At stated temps you fan should be in full lock up and sound like a jet engine on take off. If your not hearing that you have a problem.

Now your commanding 100% but only showing 30% so if accurate your not getting what your asking for, again at 100% you should sound like a Jet.
No jet = problem.

The fan clutch on a 6.0 is a viscos cluth unique in the fact that it is elictricaly controled by the PCM. The clutch has a heating element that when voltage is passed thru element the viscous fluidy is directly caused to expand in relation to the amount of voltage being feed to the element. Low voltage; small expansion High voltage; large exspansion. Giving you a variable speed control, which is very important to the entire cooling systems efficency.
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Old 09-09-2013, 04:50 PM
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Hey sorry, thought I deleted this one?
I posted this here also: Fan Clutch duty cycle using AE

I'll delete this thread and focus on that one.
Sorry

I have more details in that thread.
My main question really is, if the fan clutch is bad, can it still be commanded to come on? Mine does. It reads as 30% even when I command 100%, but, it's spinning a little faster than the engine rpm. I would think a bad fan clutch wouldn't come on at all?
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Old 09-09-2013, 05:12 PM
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The clutch can be bad/weak but not stone dead. The element it'self may be faigued or corrosion is not allowing enough volts to reach the element. Also the fluid may have leaked some or is reaching it's end of life.
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Old 09-09-2013, 06:01 PM
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That's what I was wondering. If this could be a wiring issue or a PCM issue?
Or something I can correct with a tune, programmed to turn the fan on sooner?
Or, if this is just a natural way these things die?
Without using AE to command it on, everything else points to a bad FC. It's just that when commanded, it does work quite well?

Either way, I found a motorcraft brand FC for $250. I'm just going to do it along with the radiator and water pump from BPD. Then I don't have to worry about any of it.
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Old 09-09-2013, 06:08 PM
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Essentialy when useing the A&E your superceeding the pcm commands and telling the clutch directly what you want it to do and not the pcm commands.
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Old 09-09-2013, 07:28 PM
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That's why I thougt it could be a PCM problem.
But if I understand correctly, you're saying the FC itself may be having problems (corrosion on the wires or leakig fluid) and giving the PCM bad data? And based on the bad data, the PCM isn't giving the FC the right commands?
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Old 09-09-2013, 07:48 PM
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Sort of, as long as A&E is inthe loop it takes control not the PCM. Remove the A&E and the pcm takes back over but yes this could be the cause of the fan not working correctly. Sorry guess I am useing the wrong words.
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Old 09-09-2013, 08:09 PM
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I suspect the fan clutch is failing. If you decide to replace it, go with the Snow Plow Prep version even if you do not tow. It has a more aggressive action than the standard version. Also keeps the AC nice and cold at low speeds or while idling. I installed one on my truck about a year ago.
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Old 09-10-2013, 07:03 PM
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X2 With AE at 100% you shouldn't be able to hear yourself talk. These fans are freakin loud! Get a snow plow prep clutch (it's what should have came on every truck in my opinion) and use tow/haul. I just pulled at least 13k and never went above 220 ect/eot nor over 1150 egt... A good tune and the plow fan should help you a lot, it's worth it


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