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Old 09-09-2013, 09:39 AM
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Fan Clutch duty cycle using AE

I'll keep this short.
I'm having heat issues. I have a BPD oil cooler.
When towing a small enclosed trailer up some 5% and 7% grades, I have seen 240/225 eot/ect. I also have a coolant pressure gauge. I've seen 18+psi.

I hooked up my AE to monitor the fan clutch duty cycle. It comes and goes. Usually from a stop, it will work for about a mile then goes back to 0% DC and the fan slows down.

If I use the AE to command it to 100% it comes on. It only shows up as 30% but it spins a little faster than the engine RPM. When I do this, it cools down quick and the pressure drops just as fast. Down to about 192/188 and 6-8psi. If i do a WOT at this point, it warms up a little, but not much. The pressure will rise to about 9psi, sometimes 11-12psi, but not very fast.

My question(s):
-If I can command the FC on, and it works, is it still bad?
-Should I be looking for something else? Bad PCM?
-Or, is this exactly what a bad Fan Clutch looks like?

BTW- I've got datalogs in excel format if anyone needs/wants to see them. I doubt they tell more than what I've described here already though..


Thanks in advance!
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Old 09-09-2013, 11:30 AM
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Anyone???

Just a simple yes or no?
If I command it to 100% and it turns on, does that mean its ok?
Or is this a PCM issue?
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Old 09-09-2013, 01:17 PM
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is your egr valve still plugged in?
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Old 09-09-2013, 01:29 PM
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Yeah. Should have included that info. Sorry
EGR valve is still installed and plugged in. EGR cooler is in but plugged (welded plugs in like the BPD cooler) on both ends.
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Old 09-09-2013, 01:49 PM
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Have you talked to the guys at BPD? They have been very helpfull for me. Have you loaded their engine fan tune? This also has helped me out.
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Old 09-09-2013, 02:24 PM
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Just spoke with Jacob over there at BPD. I have emailed and spoke with him once before too.
side note: I agree! Those guys are incredible. Very helpful. I was set to do HG's and he pointed me in the direction of the fan clutch. After further testing, it seems my HG's are just fine. So yeah, big thumbs up for BPD, fwiw.

I'm going to try and tune the problem away first. Matt @ Gearhead most likely?

My only issue here really, to put it another way is, will a known bad fan clutch come on, if you command it to 100% with AE?

Mine does come on. And runs a little faster than engine RPM. Also, I am running the latest flash, and, it does basically the same thing regardless of whether I'm running stock, towing or a Spartan tune.

So, I'm hoping that a custom tune might fix this? Or, if they can program it to come on whenever i engage the tow/haul button?

I'm replacing the radiator and water pump with ones from BPD. I may just do the FC anyway while I'm in there. But I'd really like to know if its bad first..
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Old 09-09-2013, 03:52 PM
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I had this posted in 2 places. Thought I deleted the other one? Hope you don't mind me copying this reply over here, along with my reply?


Quote:
Originally Posted by dannyboy950 View Post
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.

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, 07:57 PM
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thanks for posting up the answer.
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