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Old 05-04-2012, 05:20 PM
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What temp does your truck run?

I was wondering what ETC everyone is running at 75 MPH and 95+ ambient temp. I am running about 214 ETC and 212 EOT. Just wondering if that is normal or if something is wrong. Just put a new fan clutch on b/c I was getting the fan speed no signal code. I can't remember what it ran last summer. Thanks in advance.

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Old 05-04-2012, 05:28 PM
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Both seem very high for running empty even at those air temps. Is this the average, or what you saw as peaks?

Even in the summer I don't see EOT over 200* running empty, even at 75mph, unless I'm on the grades. I normally cruise around 65-68 mph, and see 184 ECT and 196 EOT on average, and know my oil cooler's coming due for a rebuild.
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Old 05-04-2012, 06:34 PM
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...Those numbers don't seem correct...

Oil temperature will exceed coolant temperature after the engine is operating for a few minutes.

I see 206-210F for ECT and 214-218F EOT at 90F ambient air temperatures when driving 65mph (a range of 6 to 9 degree difference typically) - these are recent readings with this weather and my regular driving style. My truck weighs 16000lbs and I keep the speed below 70mph ordinarily. I have a 4.88 differential, upgraded intercooler, and I run Rotella Ultra ELC (it is gold colored, EC-1 rated coolant) with a coolant filtration system and an oil bypass system.

...stock headbolts too if it matters but the truck isn't tuned...

While the thermostat isn't fully open until 219F, I have rarely seen my coolant at such a high temperature; only when ascending mountain passes such as in the Rockies or Smokies or Blue Ridge Mountains at highway speed. Depending on your location and driving style, I would be concerned about hitting 214F driving 75mph level and steady.

Thin mountain air and maintaining high boost conditions might generate elevated coolant temperatures as you report. It might be a good idea to check the ECT and EOT at startup to validate they are near ambient temperatures to determine the sending unit calibration.

Jonathan
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Old 05-04-2012, 06:58 PM
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I just installed my Scan Gauge but it has been running at around 182.
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Old 05-04-2012, 07:24 PM
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Running empty at 75mph my truck stays around 194 ECT and within a degree or two EOT.
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Old 05-04-2012, 07:43 PM
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everybody is going to say that is high.... however i doubt they are running in 95+ temps yet. In vegas that is what i see so i bet it is just fine and that was with a brand new oil cooler. I just installed the BPD ext oil cooler as I was tired of always seeing temps that high in the hot weather. I will let you know if it helps.
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Old 05-05-2012, 04:51 AM
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Thanks for all the input. I replaced the thermostat about 4 months ago because during the winter I was running about 182 ECT and about 175 EOT. I need to get me a winter cover for my BPD oil cooler. I was just concerned about the water pump may be starting to lay down on me.

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Old 05-05-2012, 04:53 AM
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Quote:
Originally Posted by howell_jd View Post
...Those numbers don't seem correct...

Oil temperature will exceed coolant temperature after the engine is operating for a few minutes.
Your EOT can run lower than your ECT if you have the BPD oil cooler and I do. You are right if it is stock cooler.

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Old 05-05-2012, 05:43 AM
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You might want to put a new degass bottle cap on, the Stants are 5 bucks from the auto parts store. By maintaining the right pressure in the cooling system temperatures will stay lower.
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Old 05-14-2012, 04:04 PM
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My Degas bottle and cap are les than 6 months old.

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