Cooling fan not coming on - Ford Powerstroke Diesel Forum
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post #1 of 28 Old 05-18-2019, 11:32 AM Thread Starter
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Cooling fan not coming on

2004 6.0 CCSB started running hot today. I know they run temps all over the place. It got up to 207 on the highway with the a/c on and 90 degree air temp flat ground no load. I have never seen it over 191 before. Fan speed stays around 350 to 400 mark idle or down the highway. I did the blue wire mod and the fan runs at a little higher than engine speed. The fan works but not coming on. How can I test to see what’s making it not come on? Thank for any help. I would like to get this figured out so I don’t sound like a jet engine going down the road.
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post #2 of 28 Old 05-18-2019, 01:47 PM
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Have you looked at the wiring harness to see if there are any broken wires? Can you spin it--Should have a little resistance?

I could not really hear my fan kick on until 210į, so the temps are a little low for that, but you did do the blue wire mod, so that should make it go full bore after a slight delay. I have since gotten rid of the Electric clutch and installed the 7.3 mechanical clutch and it runs much cooler than before.

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post #3 of 28 Old 05-18-2019, 02:50 PM Thread Starter
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Wiring look good the best I could tell from a visual inspection. The fan did have some resistance when I spun it by hand. I’ve had the truck for about 3 years now and it has always stayed right at 190. The fan works fine blue grounded. I’m assuming the power wire is good because it comes on. Is there things I can check that tells the computer to turn the fan on.
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post #4 of 28 Old 05-20-2019, 07:03 AM
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Ditch the stock fan clutch, buy a Hayden 2835 clutch (has to be a 1997 only) and adapter off of amazon, I did it and it was like 133$ total. You won't have to worry about running hot anymore and the stock fan clutches seem to never work when you need them.
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post #5 of 28 Old 05-20-2019, 07:12 PM
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Originally Posted by Fordracinjunkie View Post
Wiring look good the best I could tell from a visual inspection. The fan did have some resistance when I spun it by hand. I’ve had the truck for about 3 years now and it has always stayed right at 190. The fan works fine blue grounded. I’m assuming the power wire is good because it comes on. Is there things I can check that tells the computer to turn the fan on.
The PCM controls the fan through an algorithm that includes the coolant temp, oil temp, the delta, engine load, intake air temp, and probably a couple other things I forgot
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post #6 of 28 Old 05-21-2019, 10:58 AM Thread Starter
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I might unground the blue and keep an eye on temps just to see what it does.
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post #7 of 28 Old 05-22-2019, 06:36 PM
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I've tried all of the fan configs and mods. The best mod hands down is the 7.3 clutch and adapter.

k
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post #8 of 28 Old 05-22-2019, 07:51 PM
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I've tried all of the fan configs and mods. The best mod hands down is the 7.3 clutch and adapter.



k
Yep, I did the 7.3 mod as well!

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post #9 of 28 Old 05-22-2019, 07:57 PM
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Having a little resistance is normal, as long as its "steady" and not "bumpy." That resistance was the same for both my electric clutch when I had it and the mechanical clutch which I have now. If you do decide to put the mechanical clutch in, some complain the mechanical clutch is much louder than a good working electrical clutch. Personally, I don't hear the difference. If I open my hood at idle, I can feel the mechanical clutch engaged and blowing, whereas the electric one I didn't.

2005 F250, 189,000 Miles
Bullet Proof HD Oil Cooler w/ Cold Weather Kit, Bullet Proof EGR, Bulletproof Water Pump, 7.3 Fan Clutch
Airlift 5k Airbags and Wireless Air
Edge CTS w/ EGT probe and Fuel Pressure Sensor.
15 MPG slick; 10 MPG towing 11k fifth wheel
Ravelco

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post #10 of 28 Old 05-23-2019, 05:18 AM Thread Starter
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Think I might check into the 7.3 fan, sounds like the way to go.
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