Cooling Fan on at low speeds - Ford Powerstroke Diesel Forum
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post #1 of 21 Old 06-27-2019, 06:54 AM Thread Starter
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Cooling Fan on at low speeds

I have a 2005 F350 6.0 with a cooling fan that turns on after the engine warms up. At 210 the fan comes on and will not disengage as long as I'm driving around town. It will eventually disengage if I get it up to 60 mph or greater. I checked the wiring harness and all looks good. I'm suspecting the fan clutch but want to verify before I spend any more $ on this.

Has anyone had this issue before? If so, what was the fix?

A little more background:
I was hauling a container (heavy load) when I noticed the fan started coming on at 212 instead of 220, which it always did before. It would kick on at 212 and cut out at 202. A couple of hundred miles later it started kicking on at 208/210 and cut out at 198. I found a coolant leak at one of my stops and found it was coming from the seam of the degas bottle. Replaced the degas bottle and cap and the leak was fixed, but my fan issues continued. The code I get is P0528 Fan Speed Sensor Circuit No Signal.

Any help would be appreciated.
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post #2 of 21 Old 06-27-2019, 07:02 AM
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Originally Posted by leosabo View Post
I have a 2005 F350 6.0 with a cooling fan that turns on after the engine warms up. At 210 the fan comes on and will not disengage as long as I'm driving around town. It will eventually disengage if I get it up to 60 mph or greater. I checked the wiring harness and all looks good. I'm suspecting the fan clutch but want to verify before I spend any more $ on this.



Has anyone had this issue before? If so, what was the fix?



A little more background:

I was hauling a container (heavy load) when I noticed the fan started coming on at 212 instead of 220, which it always did before. It would kick on at 212 and cut out at 202. A couple of hundred miles later it started kicking on at 208/210 and cut out at 198. I found a coolant leak at one of my stops and found it was coming from the seam of the degas bottle. Replaced the degas bottle and cap and the leak was fixed, but my fan issues continued. The code I get is P0528 Fan Speed Sensor Circuit No Signal.



Any help would be appreciated.
Sounds like a bad fan clutch to me. Basically the same symptoms I had when mine started before it locked up completely. How does it feel if you spin it by hand? Good news is its a pretty easy job that should only take a couple of hours if you have never done one before.

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OE oil cooler and LPOP. OdawgS3, HD up-pipes, Performace valve springs, 190/30 WDI, Marty's Reg return & NeverStranded v2 Fuel System, Adrenaline HPOP, TSD tunes, KC Stage2
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post #3 of 21 Old 06-27-2019, 07:23 AM Thread Starter
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Thanks for the response. When spinning the fan by hand it feels the way it should, there's a bit of resistance but there's no binding or grinding feel to it.
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post #4 of 21 Old 06-27-2019, 07:34 AM
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Originally Posted by leosabo View Post
Thanks for the response. When spinning the fan by hand it feels the way it should, there's a bit of resistance but there's no binding or grinding feel to it.
The other possibility is that there is a wiring issue somewhere. I checked my wiring by using an ohmmeter and checking for continuity between the fan connector and the proper pins at the PCM.

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OE oil cooler and LPOP. OdawgS3, HD up-pipes, Performace valve springs, 190/30 WDI, Marty's Reg return & NeverStranded v2 Fuel System, Adrenaline HPOP, TSD tunes, KC Stage2
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post #5 of 21 Old 06-27-2019, 07:41 AM Thread Starter
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I've done just about everything on the outside of this truck, including a total bullet proof engine rebuilt, but I've never had to mess with the PCM. Is it hard to get to the connectors?

Ah! Just did a quick search and found where the PCM is. Which connector is the one that has the wires for the fan?

Last edited by leosabo; 06-27-2019 at 07:46 AM.
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post #6 of 21 Old 06-27-2019, 08:01 AM
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I've done just about everything on the outside of this truck, including a total bullet proof engine rebuilt, but I've never had to mess with the PCM. Is it hard to get to the connectors?

It is easy to do. It should be on the drivers side fender behind the battery. Here is a link to the connector locations and pin outs. It's a quick way to check in 10 mins or less.


https://www.ford-trucks.com/forums/1...ed-2006-a.html
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2003 Excursion Limited 6.0 PSD 4x4 6" lift 35x12.50x20
KDD Long block, KDD O-ringed heads, Colt stage 2 cam, Mahle .020" pistons, ARP head studs,
OE oil cooler and LPOP. OdawgS3, HD up-pipes, Performace valve springs, 190/30 WDI, Marty's Reg return & NeverStranded v2 Fuel System, Adrenaline HPOP, TSD tunes, KC Stage2
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post #7 of 21 Old 06-27-2019, 08:10 AM Thread Starter
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Great! Thanks! I'll test them out and confirm before tackling the fan clutch.

Thanks again!
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post #8 of 21 Old 06-27-2019, 10:06 AM Thread Starter
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Tested all the wires and they are all good. I'm getting continuity on all wires and power on the PCM power relay, switched power. Pretty confident the fan clutch is bad. I'll replace it and report back.

Thanks for the help letsmow10 appreciate it!
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post #9 of 21 Old 06-27-2019, 10:09 AM
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Originally Posted by leosabo View Post
Tested all the wires and they are all good. I'm getting continuity on all wires and power on the PCM power relay, switched power. Pretty confident the fan clutch is bad. I'll replace it and report back.



Thanks for the help letsmow10 appreciate it!
No problem. Let us know how it goes. On a side note... when replacing the fan do NOT cut your fan shroud. Remove the 2 brackets that hold the radiator in and the electrical cable in front of the radiator. That will allow the radiator to move enough to pull the shroud up and out easily.

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2003 Excursion Limited 6.0 PSD 4x4 6" lift 35x12.50x20
KDD Long block, KDD O-ringed heads, Colt stage 2 cam, Mahle .020" pistons, ARP head studs,
OE oil cooler and LPOP. OdawgS3, HD up-pipes, Performace valve springs, 190/30 WDI, Marty's Reg return & NeverStranded v2 Fuel System, Adrenaline HPOP, TSD tunes, KC Stage2
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post #10 of 21 Old 06-27-2019, 10:25 AM
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fan is controlled by a pulsing ground ( PWM ) pulse width modulation and a more than ECT ( coolant temp play into the pcm's strategy )

do you monitor oil temps ?

6.0 flush pdf
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