Fan running constantly...bad clutch or something? - Ford Powerstroke Diesel Forum
 
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post #1 of 8 Old 01-07-2013, 09:20 AM Thread Starter
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Fan running constantly...bad clutch or something?

Now that the hubs are replaced, I'm on to the next issue...The cooling fan runs non-stop. Even first thing in the morning when I start it. My egt's are normal, the the idiot gauge barely gets into the "normal" range. Is this the result of a bad temp sensor some where or a bad fan clutch? Coolant levels are fine and all that. Its just keeping the truck running cold. And when it's 15 degrees I dont need the fan running when I'm doing 60 unloaded down the highway...


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post #2 of 8 Old 01-07-2013, 05:24 PM
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Originally Posted by eurotrashb5 View Post
Now that the hubs are replaced, I'm on to the next issue...The cooling fan runs non-stop. Even first thing in the morning when I start it. My egt's are normal, the the idiot gauge barely gets into the "normal" range. Is this the result of a bad temp sensor some where or a bad fan clutch? Coolant levels are fine and all that. Its just keeping the truck running cold. And when it's 15 degrees I dont need the fan running when I'm doing 60 unloaded down the highway...
My fan does the same thing and from what I've heard, it's completely normal. It's turning, but not fast enough to move a lot of air. IIRC with the truck cold and OFF, you should be able to spin the fan by hand, but it shouldn't spin freely. The warmer it gets, the harder it should be to turn.

If the temp gauge is just getting into the normal range - you need a new thermostat. I guess it could be the ECT sensor, but I would say that it's far less likely. After just a few minutes of idling/driving when the gauge is just above the very bottom cold line is the upper radiator hose getting warm?

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post #3 of 8 Old 01-07-2013, 05:27 PM
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Most likely the clutch is bad and not allowing it to disengage. I have also seen the bearings freeze up and basically weld the hub to the shaft.
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post #4 of 8 Old 01-08-2013, 07:28 AM Thread Starter
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Just put a brand new thermostat in, because that was my original thought but it didnt change anything. ill check the hose and try to spin the fan by hand. With the hood open this morning(20 something degrees), it was moving quite a bit of air...


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post #5 of 8 Old 01-08-2013, 08:44 AM
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They Do though,,, It's not like an electric clutch, it's viscous coupled and never truly "disconnected". Try, first thing in the morning, to move the fan with your hand. You'll see it's got a fair amount of resistance. Not Hard to turn by any means, but certainly not "Free".
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post #6 of 8 Old 01-08-2013, 08:48 AM Thread Starter
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Originally Posted by NoRalPh View Post
You'll see it's got a fair amount of resistance. Not Hard to turn by any means, but certainly not "Free".
Is that what im looking for? Will that tell me if I have a problem or not? I mean...the truck still runs cooler than it should.


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post #7 of 8 Old 01-08-2013, 11:00 AM
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I wouldn't think it matters if the fan is running or not. The thermostat should keep it at the same temp no matter what.

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Of course I'm handy under the hood, I currently own a cummins.

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post #8 of 8 Old 01-09-2013, 02:22 AM
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Did you delete your EBV?

late 99' F350, Crew cab, SRW, 4guage pillar pod, combo driving/fog lights, 55w backup lights, drivers side battery isolation mod,6637 intake
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