coolant temps? - Ford Powerstroke Diesel Forum
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Old 08-12-2012, 02:25 PM
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coolant temps?

Got my insight hooked up checking my deltas....86 outside and cruising on the highway for around 30min at 60-70mph,no load and my coolant stood around 210-216 and oil was 210-218.The oil and coolant stood pretty close to eachother with oil being around 1-4 degrees higher..But than sometimes the coolant would rise 1-4 degrees higher than the oil...Is that normal?...At one point doing around 65-70 the coolant temp shot up to 223 with the oil around 221-224 but than the fan kicks on and brings the temps down to around 212-216..Honestly I had my truck for 5yrs now and to me it always ran hot because I would always hear the fan kick on......But now that I can check the temps I wonder what my temps will be on like a 95-100 degree day..And i'm not even pulling a trailer..........
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Old 08-12-2012, 04:32 PM
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That seems a little hot to me for a stock truck without towing.

I don't think it is hurting anything though since the fan brings it down.

Things you might check:
loose belt
plugged radiator fins (or something reducing the normal air flow)
extra heat from sticking turbo
sticking thermostat
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Old 08-12-2012, 04:54 PM
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I agree that does seem high on the coolant temp. How does the insite take readings? Does it use factory sensors or are they installed. If installed , where are they installed? If factory is used I would verify that the reading is correct. Easiest way to verify is look at all temp sensors after a cold soak and the readings should all be close to the same(within a couple degrees).
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Old 08-12-2012, 05:03 PM
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That does seem a little hot. I know mine was at 190* and that was high 90* weather today.
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Old 08-12-2012, 06:26 PM
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Thx guys..Bismic I will check all those things...How would I know if thermostat is sticking or not working?....And how do I find it?...thx
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Old 08-12-2012, 06:28 PM
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The thermostat is cheap, I would just replace it.

Thermostat (doesn't include the o-ring): 3C3Z-8575-AA
Thermostat Housing O-ring: 3C3Z-8255-AA
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Old 08-12-2012, 06:31 PM
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I totally agree.
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Old 08-12-2012, 06:35 PM
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Thats hot. when its 100+ degrees outside my truck runs ECT-190-192 EOT-195-200 at 70 mph, cooler at 55.
When its -20 - mid 70's ECT- 188-190 EOT 191-195.

Towing 10k+ my truck runs those temps yours does. id start by replacing the t-stat. im not sure on the condition of your cooling system but your rad could be getting plugged up. externally your rad might be full of stuff. washing it out couldn't hurt
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Old 08-12-2012, 06:36 PM
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Yours look perfect.I just noticed the icon I picked is named liar.
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Old 08-12-2012, 07:48 PM
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Is the thermostat easy to change out?...And where do I locate on the engine...thx
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