2004 6.0 ECT vs EOT and over heating - Ford Powerstroke Diesel Forum
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Old 09-17-2013, 08:57 PM
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2004 6.0 ECT vs EOT and over heating

Hello, I recently have been seeing my temps (ECT and EOT) rise quickly as I am pulling my 15k lb trailer up gradual grades. My temp gauge will climb quickly while going up the grade to the point where I have to pull over and let it cool down. I have not heard my jet engine fan kick on during these near over heating episodes. During this time I have been noticing a difference in ECT/EOT as much as 46-50* (208-10 ECT and possibly higher as I was concentrating on not fully overheating and 245-254 EOT). During these trips the coolant will puke out the degas bottle. No codes are being thrown.

I took the truck into a shop and they said that my radiator was seriously plugged up. I took her home and pulled the radiator and cleaned it out. There was a TON of crap in there. I put everything back together and now I am noticing that the coolant temps are staying really low (195-208*ish). I hooked up the trailer and went for a run on the same hill to test it out. No temp gauge change, no coolant puking, and the truck was driving just fine. The only issue is the high oil temps of 254* and the ECT was steady maybe around 218* ish. Fan still never kicked on.

Do I have a bad oil cooler? Bad fan clutch? Is there a way for a good mechanic to test the fan and see if it is bad?

Is the oil cooler something that a "handyman" could tackle or should it be left up to someone who knows what they are doing?

I am just wondering if I am missing something here. Thanks in advance!

Oh, I have put over $10k into the engine alone in the last 2 years....

all new injectors
EGR delete
new HPOP
(1) new injector after a new one went bad ($2k emergency fix while 800 miles from home)
Heads redone under warranty at 48k miles (currently 175k on the odo)
(2) new FICMs

Last edited by hvyw8; 09-17-2013 at 09:01 PM. Reason: add list of items replaced on truck
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Old 09-17-2013, 09:14 PM
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there is a way to put a ground wire on your fan so that during towing you can lock the fan into a "direct drive" mode. it locks up the fan. i use mine and it works great! i also added a coolant filter to keep the components cleaned out and it helped with clogging up.
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Old 09-17-2013, 09:22 PM
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with the amount of mods you've done, if i went with an oil cooler, do a relocate. like a BP kit. but sounds like you are getting a bad OC
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Old 09-18-2013, 09:19 AM
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Thanks for the info. While towing am I going to do more damage with EOT's at 254*? I just don't want to add more to the problem.
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Old 09-18-2013, 12:49 PM
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I've heard you never want your oil temps that high, there are actually plastic parts in our engines that can start to melt with oil temps get too high, I saw a guy on another forum post pics of where the plastic pieces (I am thinking they were part of the high pressure oil system, maybe stand pipes or something) had melted and ruined the motor. If your radiator was that plugged, it sounds like your cooler probably is too, since it actually has finer passages than the radiator. My fan kicks on when my EOT reaches around 220 and my ECT is around 210-215. You will definitely hear it. I'm surprised yours isn't kicking on.
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Old 09-18-2013, 03:14 PM
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multipal problems

You had a plugged cooling system and a bad clutch fan.

You cured part of the problem with the radiator but the cooler is still restricted this is evidenced by the fact that the oil is still not being cooled.
The oil cooler is the only place where the oil is cooled. The rest of the system cools the coolant.

The fan well you have been at temps that the Jet should have long ago took off.

Repair the rest of the problems and it should be good.
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Old 09-25-2013, 08:54 AM
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Breaking the bank...

I took the truck in to have the oil cooler replaced and the fan clutch. The fan clutch was only running about 20% when they manually turned it on. Started towing this morning and everything appears to be doing just fine. $1800 later I am back in business. This makes $12k in 2 years that I have spent on this truck for the engine alone. I am paying for it all over again.
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