RAM 3500 6.7 CUMMINS 4X4 DIESEL HIGH OUTPUT

[SMorgenstein]

Ram 2019 4x4 High output 6.7 cummins 3500. How hot should the engine run? I believe it should run around 180 to 200. My truck is running at 165 to 175 (temp outside 75 to 90 degrees), when its cold ( Temp. outside 20 degrees) it runs 125 to 135. I live in upstate NY. I have taken it to the Doge Dealership and they said normal engine heat should be 170. It throws no codes when they put it on the diagnostic. All recalls have been done, new injector pump, window wiper and torch specs on lug nuts. When you turn the AC off the engines heats up slightly a few degrees, when you pull hill with no AC on, it will get up to 190 but as soon as you go down the hill it drops back down into the low 170's really quick. No towing. No load.
I have called the Dodge Tech line, no help at all. Cummins can't help because Dodge owns the right to engines. Called another dealership, they couldn't give me an answer either. Would greatly appreciate your input.
thank you
Scott M

 

[Ozymandias]

Sounds like a sticky thermostat, especially because it cools out downhills. You can replace it yourself, it's a cheap and easy fix if the dealer refuses it.

 

[SMorgenstein]

Sounds like a sticky thermostat, especially because it cools out downhills. You can replace it yourself, it's a cheap and easy fix if the dealer refuses it.

Thanks for the input...that's pretty much what I narrowed it down to also, wanted to hear other's advice.

 

[Topzide]

I'd second what Ozy has mentioned. Mine runs 195 - 200 unless working her pretty hard. The Cummins wants to be nice and warm! Order up a thermostat from Geno's and get it done. Who said normal temp was 170? Service writer? Diesels work on heat and that's why in deep cold areas during the winter, you'll see trucks with cardboard on the fronts to warm up and stay warm! Pretty easy repair for even the casual wrench turner. Good luck with repair.

 

[AH64ID]

I also agree on the faulty thermostat.

The OEM thermostat is a 190° thermostat. They start to crack at 190°±3° and are full open at 207°. 215°-220° is normal for pulling a hill under load.

 

[06 Dodge]

IMO buy a Cummins T stat not aftermarket...

 

[Matt42]

IMO buy a Cummins T stat not aftermarket...

My truck is 23 years older. I made the aftermarket mistake one time. I always use a Cummins thermostat.

 

[Cummins12V98]

YEP, Cummins for sure!

 

[p-Bar]

These engines need to run hotter than back in the old days. "hot and lean"helps the emissions.