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  #1  
Old 07-23-2014, 06:18 AM
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Need help with deltas going wrong way fast!

Just had cooling system flushed then oil cooler replaced. Now me deltas at 15 degrees again but the wrong way. Before my ect never got above 204 with no load. Today it's between 210 and 212 causing my fan to come on constantly and my coolant is only 199 or less. Any ideas? New thermostat too but before the flush.
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Old 07-23-2014, 06:19 AM
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Ps I also have the super cool additive in it which is supposed to make it 5 degrees cooler.
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Old 07-23-2014, 11:33 AM
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Bump. Need advice
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Old 07-23-2014, 04:58 PM
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Last bump.
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Old 07-23-2014, 06:21 PM
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Did you use chemicals to flush it? And your post is a little confusing because all your temps are referring to ECT.
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Old 07-23-2014, 07:04 PM
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exactly i think he means his oil ( EOT) is lower than his ECT ??

but confused

if thats what He meant then
t stat may be an issue and i can't think of a god reason the EOT would be lower ?

the water wetter IDK what that could cause ?

Last edited by ZMANN; 07-23-2014 at 07:13 PM.
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Old 07-24-2014, 06:19 AM
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Quote:
Originally Posted by ZMANN View Post
exactly i think he means his oil ( EOT) is lower than his ECT ??

but confused

if thats what He meant then
t stat may be an issue and i can't think of a god reason the EOT would be lower ?

the water wetter IDK what that could cause ?
Yes, I knew this would throw everyone for a loop. My Coolant is much higher than my oil. I did have a bad cooler, my oil was constantly over 220. Yesterday unloaded it never got over 199. But my coolant did. Stayed at 210-212 unloaded. Later that evening, I put 10k pounds behind me. I grossed at 18k #. My EOT did GREAT never getting over 204 and again staying on average around 199. My ECT however, when I stopped climed to 218 and running stayed 212-214. I saw up to 18* difference in my deltas with the load on the trailer. Could the flush have taken out my Tstat? Im lost here as to why before the flush my ECT was great and then after not???? Could I have partially killed my radiator???? This makes no sense, but my secondary fan is constantly running!
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Old 07-24-2014, 06:39 AM
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Unless you have a separate cooler, what you have described can not happen. You probably have a bad temp sensor, more than likely the coolant sensor, but I would have expected higher oil temps on a long heavy pull.
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Old 07-24-2014, 06:44 AM
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Originally Posted by twoicebergs View Post
Unless you have a separate cooler, what you have described can not happen. You probably have a bad temp sensor, more than likely the coolant sensor, but I would have expected higher oil temps on a long heavy pull.
I didnt strain my engine at all. Tow tune and ran less that 55mph the whole way. Motor didnt have to work hard at all to maintain that speed. How can I test the coolant sensor?
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Old 07-24-2014, 06:59 AM
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The easiest way is to use an IR tester right next to the probe, but to get a better result you probably will need to pull it and test it in a heated water bath with a calibrated thermometer.

You could let it sit until it is dead cold and compare the 2 temps, but that won't help if the sensor misreads at higher temperatures. Most just swap in a new sensor.
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