Cooling fan issue... not engaging? - Ford Powerstroke Diesel Forum
LinkBack Thread Tools Display Modes
post #1 of 3 Old 08-01-2014, 07:12 AM Thread Starter
Join Date: Sep 2013
Posts: 86
Thanks: 2
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
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
acidburn02zts is offline  
post #2 of 3 Old 08-01-2014, 08:07 AM Thread Starter
Join Date: Sep 2013
Posts: 86
Thanks: 2
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
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?
acidburn02zts is offline  
post #3 of 3 Old 08-02-2014, 04:00 AM
Compression Ignition Addict
Join Date: Dec 2008
Location: port arthur texas
Posts: 4,222
Thanks: 1
Thanked 62 Times in 58 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
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.

Lord I shall lead them to the water but I will not try to make them drink

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

Quick Reply

Register Now

In order to be able to post messages on the Ford Powerstroke Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome