2015 2500 6.4 coolant/oil temps

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nhus1979

Junior Member
Joined
Feb 10, 2017
Posts
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Ram Year
2015
Engine
6.4
I have a 2015 2500 6.4 w 61k. I have issues with low coolant and oil temps. On cold mornings (20 or lower) my coolant WMPD would reach 190 or so, and then it would drop off to about 150 along with the oil temp dropping off from 165 down to about 125. This would then religiously trigger my ETC light to come on and the the coolant temp gauge would blank out, and the oil temp would sit at 125 and the truck would throw no heat in the cab.

First dealer I brought it to could not replicate the issue so they just cleared the codes and it was fine for about a week.

Once the issue reappeared, brought the truck into anther dealer with the ETC light on, and they changed the coolant temp sensor, and things were fine for another week.

Now I seem to be having the same low coolant/oil temp issue with no heat in the cab, especially on the highway. Coolant 150 oil 130 but no more ETC light coming on. Seems like it comes out of it slowly with idling/city driving. The photo is what the fluid temps stabilized at on the highway this morning after driving about 45 minutes.

Getting sick of paying the $100 diagnostic fee at the dealer only to have the issue remain. Anyone have this issue or any thoughts on what's going on here?

Much appreciated.

Matt
 

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yoda

Senior Member
Joined
Jul 25, 2016
Posts
460
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Ram Year
2015
Engine
6.4 Hemi
Sounds like your thermostat is sticking open at times.
 
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