Today with an outside temperature in the lower 90 the ECT/EOT difference was around 10* on the highway with empty truck and 75mph, in town 2 to 5* which seems ok. The ECT was always around 200 to 210 with the fan kicking in at 210 and then cooling to 198. This ECT seems pretty high. Is this normal or is there something wrong with the thermostat as I see in most posts an ECT around 190 to 195?

 

Mine has been hitting 205 deg. steady when it is 100 deg outside. that is with ac on high pulling 10,000lbs and running 12 lbs boost avg. In the hills it would climb to 220 coolant, 230 oil and 24 lbs boost. I feel this is normal and who knows how accurate the calibration is on the sensors or the insight. water boils at 212 sea level, add 2 deg for ever lb of pressure. 16 lb cap = 32 deg. add that to 212 and you should not boil till 242 deg.. I have reset the alarms 3 times on the insight as I figure out how far I can let things go as normal.

 

Could be your degas bottle is too full to start with.?? The min. mark is the recommended max. now..

 

jaybird, pretty sure I read in another post that the 15 deg difference comes from a Ford TSB that then tells the mechanic to check/rebuild oil cooler if there is a sustained difference of 15*. It needs to be longer than just a bit.

I'm running the Innovative tune aswell on an SCT.

I'm going to try re-installing & connecting my EGR valve, just to see what happens, as per another thread/post from cheezit. do you have your egr valve disconnected or removed?

 

Using the boiling point of water is ok, but your coolant has a much higher boiling point than plain water. 50/50 mix of zerex g05 is 265*+32=297 (at sea level).

 

Thanks again, I will log this data away. Although I will shut it down if it gets that hot...lol.

 

I was just running through the Mohave desert and Had never seen my truck at 215+- ECT 234 max EOT and was a little nervous ..sometimes the split was greater the 20 * I was running an SCT with tow tunes from gear heads so I went stock and replugged the egr ,, no difference at all except of performance loss
I have had this truck over a year and this was the first tow I ever did but all seemed fine when it was done the hills just raise temps to a point fast then back down as soon as I was on top

 

flamebuster, i never noticed your reply to my Q earlier.... my degas bottle has the sticker on it with new levels marked and you're right, the new MAX level on the sticker is the old MIN level on the bottle. I was actually below the MIN mark on the bottle, closer to MIN mark on the new sticker. I even had a puke when i couldn't see barely any coolant in the bottle. very frustrating.

as far as towing & cooling, my ECT seemed very high considering outside temps were only 70 degrees, but it was steep and we were pulling around 12K I'd guess. I don't recall hearing my clutch fan kicking on to high speed and I reached 235*. So I'll reconnect the EGR valve and see if I get the fan working.

 

the caps are known to let it puke if they are bad

 

I replaced the cap and topped up (to the proper, new MAX cold mark= slightly below old MIN mark), and the next day i had a small puke. my ECT/EOT temps did not exceed 195 that day either. go figure??!!

 

I guess this wasn't what you wanted to hear?

No, not usually. And studs are not a guarantee that you don't have HG issues.

You can keep dancing around it, or you can get it tested to see if the HG are holding.

 

And studs are not a guarantee that you don't have HG issues.

You can keep dancing around it, or you can get it tested to see if the HG are holding.[/quote]
Add to that that you very well might drive it another 100K miles before it gets worse. What our guages show us is probly the very best tool in our arsnial when comes to managing and preserving our engines(true of anything mechanical)but are sometime taken too literialy. One should take note of any warnings but also remember that that they are just that "warnings"and in some cases that doesn't mean it is about to break. Finding FTE is unquestionably good for the truck but can make the owner a nervous wreck watching and worrying about all this new found information. It seems most of us go thru that stage where we worry far to much about all the possiable disasters that might happen to our truck. I reccomend reading and rereading the arcives and tech folders if one seriously wants to put forth the effort to maintain thier truck as best as can be done. I assure that the level of comfort will perportionaly increase with increasing knowledge. The most trusted and knowledgable members have said this time and time again so I am only repeating it. Applied to this thread you will come to realize that just because it thunders once,there is no reason to run for the bomb shelter. A small puke or an ocasional sorgen of 16* or even 25* is no cause for alarm. Just continue to monitor to see if that becomes the norm but don't hit a bridge as a result of paying too much attention to all the guages. Long live the 6L and those who own them.

 

Isn't that the truth

 

Sounds like you covered all your bases next step is check for gases in the coolant. I am guessing everyone is right most likely head gaskets.

 

okay now those last 4 posts are some of the best posts i've read in a LONG time! Well put you guys!!

1) YES... I don't want to hear or believe i could have a head gasket issue!!

And to tie into what you others said, especially da-bees..... these forums and other forums and the whole stigma of the dreaded Ford 6.0L is what sent me in a head spinning quest to perfect my truck against any of these potential issues!! I probably would have done exhaust, maybe gauges and stuck with my Edge Platinum if not for the info-overload. But info caused me to add SCT instead of Edge, EGR delete, and coolant filtration. I can thank the info super-highway for all of that!!

Although I don't want to hear or believe head gaskets, I will be realistic and definitely try to confirm or deny. So now how do I get that checked to rule out or confirm? Did I mention ARPs & head gaskets were done about 20K miles ago?