Bad Thermostat Causing ECT/EOT Temp Deltas?? - Ford Powerstroke Diesel Forum
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post #1 of 19 Old 06-14-2013, 03:34 AM Thread Starter
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Bad Thermostat Causing ECT/EOT Temp Deltas??

Could someone help me understand how a bad T stat (or both) could cause a 20 degree higher EOT than ECT? I have a P012F error code and the dealer is chasing this as a potential cause.

2008 F250 PSD, crewcab, shortbed, stock, Insight CTS, 90,000 miles
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post #2 of 19 Old 06-14-2013, 05:43 AM
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*shrugs* only way I could think it would do that was if it wasn't opening all the way and its impeding coolant flow.
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post #3 of 19 Old 06-14-2013, 05:51 AM
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you don't tell us the actual temps? no monitoring device ? EDIT you have a insight so ?? what were the actual #'s

this delta issue between EOT ECT can happen if the T-Stat doesn't get the engine up to temp but the oil does its own thing and is say 200

but the T- stat is keeping the engine coolant at 180

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post #4 of 19 Old 06-14-2013, 06:47 AM Thread Starter
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ECT running 194 to 196. EOT running around 20 degrees hotter. After 20 minutes, the wrench comes on. That is at 75 degrees and running normal--no towing, etc.
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post #5 of 19 Old 06-14-2013, 06:49 AM
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Hmmm
I would be more concerned with the EOT sender since the ECT seems fine


do they both read close to ambient if it sits all night ??

hows the oil ?

ps the normal cause that I have read about for you obd code is a restricted oil cooler and possible coolant debris causing the blockage

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Last edited by ZMANN; 06-14-2013 at 06:53 AM.
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post #6 of 19 Old 06-14-2013, 06:56 AM Thread Starter
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ECT and EOT start off at ambient temp and climb steadily and evenly until ECT levels off in the 194 range but EOT keeps climbing to 20 or 22 degrees higher and then levels off at that delta. Normal loads. When I climb a steep grade ECT rose to 206 - 208 and EOT rose to 228.
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post #7 of 19 Old 06-14-2013, 06:59 AM
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This sounds like a clogged oil cooler to me, not a t-stat problem. Good luck with it man.

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post #8 of 19 Old 06-14-2013, 07:04 AM Thread Starter
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yea, think it will be the oil cooler too. And that will cost me--no warranty. Ouch!
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post #9 of 19 Old 06-14-2013, 07:08 AM
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agreed

why are they even thinking t stat ?? or was that you brainstorming ?

either way good luck and maybe time for a coolant filter ?

not sure if the 6.4's have any results with the reverse flush I have read about like the 6.0's have ??

even then it's far and few between that it seems to help

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post #10 of 19 Old 06-14-2013, 07:30 AM Thread Starter
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It was the dealer that said there was a bad t stat. They are replacing it; then full clean/flush and then see if the deltas still are there. Apparently, Ford has already installed two oil coolers under warranty. I bought used so I did not know.
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