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Old 10-29-2012, 08:27 AM
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Stuck Thermostat?

Please help, I have recently had the EGR delete, oil cooler rebuild, arp studs, and head gaskets. The system was flushed 3 times. I had a long trip this weekend and notice ECT at 194 and EOT at 202. Temps outside were really mild and I was not hauling anything more than 1000 pounds. Then the thermostat would open and the ECT would drop to 188. I am not sure if this is normal or not, please help.
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Old 10-29-2012, 01:38 PM
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Looks like an efficntly working cooling system to me.
That is the way the system is supposed to work. Thermostat opens from 192 to195 deg. It exchanges the cooled coolant from the radiator with the heated coolant in the engine.

When watching the event on live data you can see the temp drop to match the coolant temp that was in the radiator.
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Old 10-29-2012, 03:13 PM
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danny, i guess im still confused because the eot stays at 188 so in reality my deltas are 14 and stays there, Is this normal? I am still learning this am have read ALOT about this but I just want some piece of mind after spending this amount of money. When you read about the spread being 15 between the ECT and EOT and after the flushing 3 times and oil cooler rebuild I just thought I was going to see the spread closer to 5-10. Thanks for your help.
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Old 10-29-2012, 04:13 PM
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if your coolant temp drops, so should your oil temp. your deltas are where they should be.

bailey
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Old 10-30-2012, 01:55 AM
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van, that is the issue... the oil temp stays around 202. I was under the impression that the oil would drop relative to the coolant but it does not. The temps stay around 12-14 degrees and thus my confusion. If 15 degrees is the threshold of an oil cooler failure and this one was just rebuilt with the proper flushing procedures followed why are the temps at 12-14?
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