Cooling fan issue... not engaging? - Ford Powerstroke Diesel Forum
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Old 08-01-2014, 07:12 AM

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Cooling fan issue... not engaging?

Hey guys...

I've got a bone stock '06 f550... 210k on the clock.

Up until yesterday, the fan has always worked as it should. The clutch would engage and operate for 10-30seconds and then it would wind down... truck never has ran hot.

Yesterday, the fan clutch stopped engaging. No CEL or anything like that and again, truck is bone stock.. no tuner or deletes. Truck got hot (3/4-7/8 up on the gauge) while sitting in traffic and the ac stopped blowing cold. Got moving again and it cooled down and stayed cool as long as the truck was moving. This morning, the fan engaged for a few seconds after first start up but hasn't cycled again since.

I'm banking on the clutch itself. Anything else to check before ordering a clutch from ford?

Thanks guys
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Old 08-01-2014, 08:07 AM

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Ok.. now it seems to be working. Hooked up a scanner to check for any codes... found a bunch of FICM related codes (yay!!) but nothing to do with the fan.

Now with the truck running at idle, the fan is engaging like it should.

What would cause an intermittent fan clutch issue?
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Old 08-02-2014, 04:00 AM
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It may be a weak clutch or your not reaching temps that the PCM doesn't think it needs to turn the fan on. There are a number of sensors that the pcm uses for fan operation. not just coolant and engine oil temps.

Found my link.
I have spent the last few days trying to write apostabout heat heat exchange but I keept making it more complicated than I wanted it to be.
The idea is simple but the process is quite complex. You remove heat from A transfer it to B and then transfer that collected heat to C and disperse it the atmosphere. To actually doe this involves a lot of variables and complex computations.

While researching and refreshing my own memory I came across a site with a simplified explanation that I decided to use instead.

I hope you all will find it usefull. Read and enjoy but it is long and kind of tedieous.

Last edited by dannyboy950; 08-02-2014 at 04:03 AM.
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