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Old Jan 7, 2013 | 11:22 AM
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T-Stat Q
Recently resolved a driveability issue, new injectors, but during my diagnosis and testing someone here recognized my low running ECT.

Q1 What replacement thermostat is recommended,AZ, Oreilley,NAPA and what temperature.

Q2 What problems could be created by running with low temps?

Thanks for everyone's help.
 
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Old Jan 7, 2013 | 11:30 AM
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How low of a temp? I run 181 to 185 most of the time
 
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Old Jan 7, 2013 | 11:37 AM
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Thats a good point! Runs at 172- 180. Really tough to get it above 185. I think normal 185 to 195. maybe I shouldn't be concerned.
 
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Old Jan 7, 2013 | 12:35 PM
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OEM thermostat preferrably. You should be running at around 190*. Lower temperature results in lower MPG.
 
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Old Jan 7, 2013 | 05:18 PM
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Smile 6.0 t-stat
Only use Ford t-stat. When it fails it will fail in the open position.Others may fail in the closed position and barbecue your engine. Just a warning.
 
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Old Jan 7, 2013 | 05:30 PM
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Motorcraft t-stat only and you should expect temps around 190 with a good t-stat

Josh
 
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Old Jan 7, 2013 | 05:31 PM
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Originally Posted by KRDiesel
How low of a temp? I run 181 to 185 most of the time
You need a new t-stat

Josh
 
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Old Jan 7, 2013 | 05:32 PM
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My 05 runs consistantly between 194 and 204 depending on load and ambient. Diesels have no spark plugs and rely on compression and heat to run. The higher the more efficient within their design parameters.
 
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Old Jan 7, 2013 | 08:16 PM
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I usually run 184-190 in the winter. 190-200 in the Summer. My stat's stayin in.
 
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Old Jan 7, 2013 | 09:24 PM
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Originally Posted by Bullitt390
You need a new t-stat

Josh

I have replaced it twice with ford parts and the temp does not change
 
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Old Jan 7, 2013 | 09:29 PM
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Originally Posted by KRDiesel
I have replaced it twice with ford parts and the temp does not change
I find this interesting, especially due to your location. I'm running 185-186* with occasional increases to 192*, but it's below freezing here, even the teens. It makes me wonder about my fan and whether it's kicking on too early?
I also have replaced my T Stat.
 
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Old Jan 7, 2013 | 09:46 PM
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during the summer it will run 190-195, and on a long pull i can hit 210. But in the winter it is mid 180
 
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Old Jan 7, 2013 | 09:48 PM
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Originally Posted by KRDiesel
I have replaced it twice with ford parts and the temp does not change
Seems odd. It can be zero degrees and ill see 190-192 cruising at 65.

Josh
 
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Old Jan 7, 2013 | 09:51 PM
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What about your oil temperature? Is it within 15* of the coolant temp. even the ECT is in the mid 180?
 
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Old Jan 7, 2013 | 10:06 PM
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even when the truck was new temp was mid 180.

Oil temp is another story, i need a new cooler so i am running 210 to 220
 
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