Engine Fan Running All The Time

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Oct 28, 2018 | 09:11 AM

roostercrows

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Laughing Gas

Joined: Aug 2005

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From: Port Elgin, On

Engine Fan Running All The Time

Hey guys,

Its as simple as the title says, my fan runs all the time, from the time I start the truck until I shut it down. I assume its the clutch but I'm looking for other potential causes before just go ahead and replace it.
The oil temp is steady at 175*, and the tranny temp stays at 135*.

Could there be another cause for this?

Oct 28, 2018 | 09:32 AM

Walleye Hunter

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Joined: Mar 2014

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From: Douglassville, PA

Usually when the fan clutch fails it locks up. Try spinning it on your cold truck and see if it's frozen up.

Oct 28, 2018 | 12:40 PM

axmrdr

Tuned

Joined: Jul 2007

Posts: 305

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I think you already figured it out.

Oct 28, 2018 | 12:59 PM

roostercrows

Thread Starter

Laughing Gas

Joined: Aug 2005

Posts: 831

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From: Port Elgin, On

Thanks Mark, I checked and its frozen. Now is it possible that since I just had the fan off to install the Navistar water pump and maybe didn't re-install it properly? Or is it just the clutch is done?

Oct 28, 2018 | 01:03 PM

Walleye Hunter

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Joined: Mar 2014

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From: Douglassville, PA

I don't know if or how it could installed improperly. It's just the large nut off and then back on, isn't it?

Oct 28, 2018 | 01:06 PM

roostercrows

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Laughing Gas

Joined: Aug 2005

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From: Port Elgin, On

I think your right Mark, I thought I'd ask the question though.

Now is it ok to drive as is?

Oct 28, 2018 | 01:07 PM

Walleye Hunter

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Joined: Mar 2014

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From: Douglassville, PA

Yep, it will just be noisy and steal some of your HP. But in the winter it will prevent the engine from getting warm.

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Oct 28, 2018 | 01:39 PM

Bill Kay

More Turbo

Joined: Mar 2013

Posts: 523

Likes: 9

From: Carrollton, Ga

I was always told that laying a fan with a thermal clutch down flat will cause them to go bad. Probably not true because when you buy one at the parts store they don’t even consider the orientation of the box it is in. That said, did you lay it flat for an extended period of time before re-installing it?

Oct 28, 2018 | 02:57 PM

#10

roostercrows

Thread Starter

Laughing Gas

Joined: Aug 2005

Posts: 831

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From: Port Elgin, On

I did lay it down on the ground but only for the time it took to change out the water pump, like 3ish hours.

Oct 28, 2018 | 03:11 PM

#11

Sous

FTE Leadership Emeritus

Joined: May 2014

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From: Lake Hartwell, GA

I had my fan clutch flat/horizontal for a couple days and it is fone 4 years later. Also, think about special handling that would be needed during shipping from the retailer if this was true.

Oct 29, 2018 | 12:23 AM

#12

'88 E-350

Fleet Mechanic

Joined: Jul 2010

Posts: 1,753

Likes: 34

From: Los Angeles, Ca.

There are some clutches that can leak if laid flat, old Porsche I think it was. These clutches don't care. It could be that you damaged it somehow or maybe just a fluke that it failed right after the work.