My EOT vs ECT is normally about 8-11 degrees apart. Well, when it gets extremely cold I have seen a separation of about 15 degrees. This only happens when it's extremely cold. I have no other signs of a bad egr cooler. No crust around coolant bottle, no missing antifreeze, egr valve and looking down into egr cooler are both dry. Should I be concerned? I am leaving for a trip in two weeks (11 hrs each way) up into the mountains. Should we take my bro-in-laws Cummins instead of my truck?

BTW - pulling a two-place open sled trailer out West and pulling a 4-place enclosed sled trailer back home.

Thanks,

Mike

 

15 degrees is within spec.

But do check to verify your thermostat is not stuck open.

 

If your ECT is not at 190*F + your spread will not count... My thermostat was stuck open.. The hottest my truck would get is 180 and my EO was always 12 or more degree spread.. Replaced my thermostat now ECT comes up to temp 193 and my EOT is around 196-200

 

Please remember to use some common sense here. Just because the temperature has a 15* spread does NOT necessarily mean you have a bad cooler. You need to look at how high the oil temperature is getting also. If it never gets over 220, for example, and your ECT is only 180, for example, then you might have some other kind of problem--thermostat, sender, etc. Also, oil temps change slower than coolant temps so that must be taken into account as well.

 

I wouldn't worry about it,as was said you're in spec. My truck has approx. the same spreads if running empty in cooler weather. If the weather heats up or I put a load on the truck the spreads actually come together more. My ECT is approx. 188 - 190 in cool weather with no load and under load my ECT will get up into the mid 190's and the EOT maintains. approx. the same. I have always attributed this to the thermostat not being completely open and slowing the flow of coolant in the ststem. I say you're in excellent shape (that is if your ECT temps. are where they need to be). Have a safe trip,you don't wanna' ride in no stinkin' cummins!!!

 

My ECT has been showing 186* degrees consistently all winter with an occasional 190*. But it's been in the negatives for lows and around 20 for highs the last couple of days and my ECT has been at 182*. My EOT nevers gets above 197*.

How do I check my thermostat or the sender?

Thanks,

Mike

 

Someone else will chime in if I'm wrong,but I don't think you need to check anything. 190 - 195 ECT is proper operating temps. with a no load situation in normal temps. The COLD temps. you are seeing will no doubt make the FEW deg. diff. you are seeing. Your ECT MUST be 190 or greater for the 15 deg. temp. spread test to be accurate (per Ford). That being said,the temps. you are seeing are IDENTICAL to mine in the type of temps. you are operating in and my spreads get even closer together in warmer temps./higher load situations. Trust me,you are fine. As far as testing the thermostat,the only way I know of is to pull the thermostat,put it in a pan of water on the stove and put a thermometer in the water and visually watch the thermostat open and see what temp. the thermometer reads when this happens. But again,if I were you I wouldn't go through the trouble because your temps. sound good to me,and I'm as **** about my truck as anybody!! Have a safe trip,you're good to go!!

 

Your temps appear completely normal.
I just replaced my t-stat 2 months ago.
It was 38* today, my ECT got to 190 then the t-stat opened
ECT fell to 188. My EOT warms up slowly to 193-195*.
My TFT only warms up to 139* by the time I got to work.

In the morning, observe all the temps once you start the engine
your ECT and EOT should be very close. The TFT is typically
off by 10 or more since it doesn't get as hot during my commute.