Trans Temp Sensor In Line With Aux Cooler? - Page 2 - Dodge Cummins Diesel Forum
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post #13 of 30 (permalink) Old 05-23-2018, 11:04 PM
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I deleted that about a year after getting the 97, now i'm running the one that the PO had on the Blazer when I got it. I didn't have a temp gauge on the 97 so I don't have anything to compare to.
Yea that confirms what Iíve always thought. My water cooler is actually heating up the fluid to a point. I donít think I really need it, I donít plan on going anywhere that gets extremely cold.

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post #14 of 30 (permalink) Old 05-23-2018, 11:08 PM
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When you buy aftermarket trans pans most will have a bung for a sender, there can't be more than a couple degrees difference.
Only potentially 100 degrees.

Correct place is the cooler output line so you can use it drive by. Not much you can do but slow down with a non-lockup trans.

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post #15 of 30 (permalink) Old 05-24-2018, 09:30 AM
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Only potentially 100 degrees.

Correct place is the cooler output line so you can use it drive by. Not much you can do but slow down with a non-lockup trans.
So your saying over the winter when my gauge that started at 100 wouldn't move past 100 it was really 200 degrees?

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post #16 of 30 (permalink) Old 05-24-2018, 11:01 AM
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So your saying over the winter when my gauge that started at 100 wouldn't move past 100 it was really 200 degrees?
What heís saying is the cooler output line is much hotter than the pan..... but I read on I believe suncoasts website that it is much hotter but still not the proper place, the pan is still the proper placement for a sensor to watch for trans and oil damage. Iíll try and find a link
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post #17 of 30 (permalink) Old 05-24-2018, 11:17 AM
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What heís saying is the cooler output line is much hotter than the pan..... but I read on I believe suncoasts website that it is much hotter but still not the proper place, the pan is still the proper placement for a sensor to watch for trans and oil damage. Iíll try and find a link
I understand that the line going to the cooler will be hotter but 100 Degrees? I have a infrared gun i'll do some testing since I have nothing but time.

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post #18 of 30 (permalink) Old 05-24-2018, 11:52 AM
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Ok just went for a run and got the engine to temp so the trans should have been, outside temp was 75 degrees. My gauge was showing about 105 with it idling in my driveway, the hot line to the cooler was showing 150 degrees. I thought that 100 degrees was a little high of a difference in the temp between pan and line to the cooler.

From searching Google I found the ideal operating temp range for the trans is 160 to 200 degrees which would be the temp going into the pan where it gets sucked into the filter. I would rather monitor the temp the fluid is returning and use the line temp to the cooler for the sensor for a cooling fan for the auxiliary cooler.

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post #19 of 30 (permalink) Old 05-24-2018, 12:07 PM
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You have a truck, use it like one instead of a car. Driving around empty is not a good representation of reality. Drop 10k behind it and roll up a 4% grade for 5 or 6 miles and then see what you think of the disparity. If you really want to see wht is going on put 3 temp sensors in, one in the cooler output line close to the trans, one in the cooler return line close to the trans, and one in the pan. NOW go do test empty and loaded.

The only reason to put a temp sensor in the pan is not to scare the customer and cause more questions. Pan temps are much slower reacting and more influenced by heat soak than anything. Cooler out put defines how hard the trans is working and dictates changes in driving style. Bling versus useful, pretty simple. The OE temp sensor is a perfect place to put trans temp probe then just jump the sensor it never influences trans operation. Eyes and right foot become the controls.
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post #20 of 30 (permalink) Old 05-24-2018, 12:38 PM
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I totally understand about loads and temps and what happens with cooling systems on both engines and the trans. I was just giving a test on running it hard and then checking the temps.

If you would have stated 100 degrees difference while towing it would have been easy to understand. I'm not going to load up my trailer just to find out as I mostly DD my Blazer and alot of the people that have there trucks do the same.

The Thread starter has a mounted cooler with a fan so he shouldn't have a problem with temps and if he knows what the temp is for normal driving and then has a trailer and see's it 100 degrees higher he would know.

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post #21 of 30 (permalink) Old 05-24-2018, 01:17 PM
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Originally Posted by cerberusiam View Post
You have a truck, use it like one instead of a car. Driving around empty is not a good representation of reality. Drop 10k behind it and roll up a 4% grade for 5 or 6 miles and then see what you think of the disparity. If you really want to see wht is going on put 3 temp sensors in, one in the cooler output line close to the trans, one in the cooler return line close to the trans, and one in the pan. NOW go do test empty and loaded.

The only reason to put a temp sensor in the pan is not to scare the customer and cause more questions. Pan temps are much slower reacting and more influenced by heat soak than anything. Cooler out put defines how hard the trans is working and dictates changes in driving style. Bling versus useful, pretty simple. The OE temp sensor is a perfect place to put trans temp probe then just jump the sensor it never influences trans operation. Eyes and right foot become the controls.
The oe temp sensor does influence operation, it kicks the trans out of overdrive when the fluid is too hot (like 230 if I remember right) but if you had a gauge sensor in there you really should kick it out of overdrive manually if it gets anywhere near that anyway.
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post #22 of 30 (permalink) Old 05-25-2018, 01:12 AM Thread Starter
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My original thought/question is if the sensor from the aux fan can be replaced with the guage sensor? If so, the next question (or maybe should gave been the first) is, where does it get its reading from? It seems to go into a "T" fitting on the front of the 46rh. Is this in line with what you've seen?
The next most ideal option, I'm guessing, is to mount sensor on the cooler line. If so, does this pic look like an accurate representation of what needs to be done? Looks like I'd have to cut the line and splice in a "T"? The pic with the markings is RPegram's, which I think is a 47rh. The other is mine.
Is 100 degrees the approximate difference between the cooler line and the pan?
I appreciate all the thoughts.
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post #23 of 30 (permalink) Old 05-25-2018, 02:21 AM
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My original thought/question is if the sensor from the aux fan can be replaced with the guage sensor? If so, the next question (or maybe should gave been the first) is, where does it get its reading from? It seems to go into a "T" fitting on the front of the 46rh. Is this in line with what you've seen?
The next most ideal option, I'm guessing, is to mount sensor on the cooler line. If so, does this pic look like an accurate representation of what needs to be done? Looks like I'd have to cut the line and splice in a "T"? The pic with the markings is RPegram's, which I think is a 47rh. The other is mine.
Is 100 degrees the approximate difference between the cooler line and the pan?
I appreciate all the thoughts.
If you replace the sensor for the aux fan with the temp sensor for the gauge how do you plan on kicking the fan on? And assuming the picture of the two rubber lines spliced into the factory hard lines is your truck? It looks exactly like how mine is set up. Iím not a fan of those fittings usually but they havenít leaked on me (knock on wood). If I were you I would either put the sensor in the trans pan like most recommend or replace the factory temp sensor in the output line. Personal preference so itís up to you just remember the output line does read hotter the harder you work the truck.
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post #24 of 30 (permalink) Old 05-25-2018, 08:31 AM
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I look at it this way, from what I found out normal operating temp for the trans is between 160 and 220. If the sensor is in the pan you know that your trans cooler is doing it's job when the temp is in the normal operating range. I like knowing the temp of the fluid going back to the trans is within range.

If you move your sensor for the cooling fan somewhere else then the auxiliary fan isn't going to do it's job like it's supposed to.

When I did my test I was within 50 degrees.

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96 F350 SC dually zf5, 4x4, 92 Cummins, THD 5x12's, THD fuel pin, THD HVLP with adjustable fuel pressure mod, WM, h1c 60/60/12cm WG wired

Last edited by 9297oldram; 05-25-2018 at 01:07 PM.
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