Is this a bad sign?

[07Diesel]

I went camping (not towing) yesterday and when i was on the open freeway the differences between the ECT and EOT was about 25-30, yes i know that is not normal and probably isnt good at all but my question is my ECT flucuates and it is obserd, thats not normal right?

ECT was about 180 average occasionally it would go up to 190 but then it would go all the way down to like 174 and at the same time my EOT was normal 206-208. When in town sometimes my ECT will go up to 200 (like once) and i would think just by going down a hill my coolant temp shouldn't go down

Im hoping its not the coolers because i cannot really afford it but i am going to do the flush and change the coolant to CAT ELC and also change out the thermostat either this week or next.

It doesnt really seem like the oil cooler is going bad or clogged because i would think the EOT would shoot up past "not normal", anyone else have an experiences like this?

[2 stroker]

Originally Posted by 07Diesel

I went camping (not towing) yesterday and when i was on the open freeway the differences between the ECT and EOT was about 25-30, yes i know that is not normal and probably isnt good at all but my question is my ECT flucuates and it is obserd, thats not normal right?

ECT was about 180 average occasionally it would go up to 190 but then it would go all the way down to like 174 and at the same time my EOT was normal 206-208. When in town sometimes my ECT will go up to 200 (like once) and i would think just by going down a hill my coolant temp shouldn't go down

Im hoping its not the coolers because i cannot really afford it but i am going to do the flush and change the coolant to CAT ELC and also change out the thermostat either this week or next.

It doesnt really seem like the oil cooler is going bad or clogged because i would think the EOT would shoot up past "not normal", anyone else have an experiences like this?

At 174* your t/stat is stuck open your oil temps are not bad. What are you useing to check temps.
2 storker

[mah77]

2 stroker is correct. My ECT used to fluctuate like that as well, until I had the t-stat changed. I'd suggest installing a new one, and then see where your temp spread sits. If it's still a huge difference like that, then your oil cooler is on it's last leg.

[07Diesel]

Originally Posted by 2 stroker

At 174* your t/stat is stuck open your oil temps are not bad. What are you useing to check temps.
2 storker

I'm using a edge platinum is what they call it I believe I just bought it like a month or so ago

[NYC F-350]

Change the thermostat first. Then get your delta when it is operating properly.
Hold off on that flush for the ELC until you see where you stand.
Don't put off getting that done.

[07Diesel]

Originally Posted by NYC F-350

Change the thermostat first. Then get your delta when it is operating properly.
Hold off on that flush for the ELC until you see where you stand.
Don't put off getting that done.

When changing the thermostat don't you need to drain the radiator?

[NYC F-350]

Nope, you might drain off a gallon or so.

[2 stroker]

If you are going to just do a t/stat get a new o-ring, i do not like leaks
2 stroker

[FourFun]

Originally Posted by mah77

2 stroker is correct. My ECT used to fluctuate like that as well, until I had the t-stat changed. I'd suggest installing a new one, and then see where your temp spread sits. If it's still a huge difference like that, then your oil cooler is on it's last leg.

Great advice. Do this then report back

[bismic]

The 15*F delta test is only valid at 190 *F and up coolant temps and running 65 mph on the highway.