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  #1  
Old 06-24-2013, 02:40 PM
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coolant temp sensor?

Alright....I took a 700 mile trip to TN(still here). Just after I left home and truck was up to normal operating temp...the coolant temp went from 188 to 178. Then all of a sudden went back up to 190. Im 100% sure its not the thermostat... it was replaced a few months ago. It acted up like this a couple times and I'm leaning towards the coolant temp sensor. What do you guys think?
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Old 06-24-2013, 03:13 PM
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I'd say it's either a coolant sensor or the Edge CS. I've heard of weird things happening with those things as of late.
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Old 06-24-2013, 03:25 PM
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I've never had an issue with the readings on the CS fluctuating like this till now. Had it for couple years now. Has read out symptoms like this just started to arise Nate?
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Old 06-24-2013, 03:34 PM
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Not sure Chris, I had a buddy who had some weird stuff happen to his CTS. I can't remember all the details. I wanna say it was something to do when he updated his device. Sorry I can't help more man. Has it done it since?? I just don't see the sensor being the issue. They either work or they don't (kind of like fail high or low).
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Old 06-24-2013, 05:01 PM
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It acted up couple times is all. However I did find out that I may need to replace my oil cooler. I ran Eric's extreme x with early lockup. Temp deltas got as much as 22* apart at times traveling 75-80mph through the hills of west Virginia, Virginia and Tennessee. Gonna change temp sensor when I get home and see if it'll happen again. Curious to see if it'll happen again till I get back home tho. Coolant temp stays within normal spec. Oil temp however does seem to be high at times.
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Old 06-24-2013, 06:11 PM
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Was the 22* delta while going uphill, downhill or level ground?
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Old 06-24-2013, 06:46 PM
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More so going up the grades when giving it some throttle. Was nearly 90* outside. Going down some of the grades the delta would get about 15* apart then go back up when I hit the next grade. I'm gonna change to Eric's late lockup tune. I think the early lockup tune made truck lug a little. So when egts went up...so did the oil and coolant temp. Coolant never got out of control....may 202 was the highest. And highest oil temp was 222 I believe...both at the same time. Truck ran pretty decent for the first 700 miles down here...but this early style hybrid is killing some of the trucks performance.

Last edited by strokin6L; 06-24-2013 at 06:50 PM.
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Old 06-25-2013, 02:34 PM
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My CTS started doing the same thing the past couple of weeks. sometimes it will go from 204 down to 178 back up to 190 then back to 204 all with in about a minute. i have been pretty concerned about it but before this my delta was always between 5 and 10 degrees then all of a sudded im having 20 plus degrees in delta but not for very long.
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Old 06-25-2013, 02:38 PM
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Yeah my delta now when up to operating temp is always 15-20 degrees. ECT is always between 188-192 and EOT now 203-208
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Old 06-25-2013, 07:08 PM
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My CS has done that twice. Didn't really know what to think, but as long as its not constant I wouldn't worry about the CS
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