Unique coolant temp question? - Ford Powerstroke Diesel Forum
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post #1 of 11 Old 03-23-2012, 05:06 AM Thread Starter
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Unique coolant temp question?

When I was leaving for work this morning, driving on normal, 50 mph roads, my EOT was about 192 and my ECT was 188. As soon as I got on the highway and got up to about 75 mph, my EOT stayed relatively the same, but my ECT dropped to 182 for just about the whole 7 mile ride to my exit. As soon as I got off the highway and dropped back down to about 45 mph, the ECT rose back up to 188.

WTF? I've never seen/heard of ECT dropping while you're working the motor harder, although I'm also not that experienced with 6.0's or diesels in general. There's no puking, coolant level is just a bit below the MIN line in the degas bottle, but it is the gold coolant (until I change it soon).

Anyone have any experience/knowledge with this?

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post #2 of 11 Old 03-23-2012, 05:22 AM
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What was the temp outside? Sounds like the stat is failing, to me


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post #3 of 11 Old 03-23-2012, 05:26 AM Thread Starter
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It was probably about 55 out when I was driving.

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post #4 of 11 Old 03-23-2012, 05:33 AM
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Yup, I'd blame the stat


2006 F350 SOLD
* KMC XD Monsters wrapped in Hankook ATM's
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* 4" TB exhaust
* SCT X2 with Gearhead, PHP and ID tunes
* Edge Insight CTS
*Full Bulletproof Diesel kit with remote oil cooler
* Blue FPR spring
* 6.4 Banjos
* Repaired FICM by BPD
* Dfuser coolant filter
* Stage1 MTW turbo



New truck has a Cummins and a handshaker
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post #5 of 11 Old 03-23-2012, 05:35 AM Thread Starter
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Good deal. So I take it that I shouldn't worry too much about the temp delta then, unless it returns after I put in a new one, correct?

04 F350 SC LB: Warren Stock+ injectors, Sinister coolant filter, DC Power 185 amp alternator, EDGE Insight CTS w/ EGT, Diamond Eye 5" turbo back straight pipe, S&B intake, MTW Hybrid w billet wheel, Riff Raff boots, Studded, Strokers Unlimited fuel RR system
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post #6 of 11 Old 03-23-2012, 05:43 AM
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Yup, replace the t stat and recheck the deltas. ECT should be at 190 when you check the delta.

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post #7 of 11 Old 03-23-2012, 05:43 AM
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Yeah, your ECT should be 188-190 under normal driving conditions, and your EOT less than 15*, but closer to 10*. Also, that speed is too fast to get a good reading on the delta. You wanna be at 65mph, no load, engine at operating temp, and on semi flat roads


2006 F350 SOLD
* KMC XD Monsters wrapped in Hankook ATM's
* 08 style mirrors
* 4" TB exhaust
* SCT X2 with Gearhead, PHP and ID tunes
* Edge Insight CTS
*Full Bulletproof Diesel kit with remote oil cooler
* Blue FPR spring
* 6.4 Banjos
* Repaired FICM by BPD
* Dfuser coolant filter
* Stage1 MTW turbo



New truck has a Cummins and a handshaker
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post #8 of 11 Old 03-23-2012, 05:50 AM
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Quote:
Originally Posted by TruckNorris View Post
Good deal. So I take it that I shouldn't worry too much about the temp delta then, unless it returns after I put in a new one, correct?
That is exactly correct.

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post #9 of 11 Old 03-23-2012, 05:55 AM Thread Starter
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Awesome. I appreciate the info

04 F350 SC LB: Warren Stock+ injectors, Sinister coolant filter, DC Power 185 amp alternator, EDGE Insight CTS w/ EGT, Diamond Eye 5" turbo back straight pipe, S&B intake, MTW Hybrid w billet wheel, Riff Raff boots, Studded, Strokers Unlimited fuel RR system
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post #10 of 11 Old 03-23-2012, 03:27 PM
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I have seen temps differ alot I have not had any problems and dont know what I should be looking for or doing. My EOT is 192 and the ECT will be around 180 ish. I have seen deltas with as much as 20-22 degress different is this not good. I was told that any difference then 15 bad stuff starts it has always been like this.

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