Won’t heat up!

[Northwoodspumper]

I have 2015 ram, just put the second thermostat in it and it still won’t get up to normal temperature range. What else in the system could be causing that?

 

[Tremper126]

Possibly the grille shutters not closing and opening? What temp are you looking to achieve?

 

[Northwoodspumper]

Possibly the grille shutters not closing and opening? What temp are you looking to achieve?

At an idle it won’t get over 125

 

[Tremper126]

what about while you are driving? Diesels don’t like heating up at idle.

 

[Northwoodspumper]

Normal driving it sits around 145 -150. At highway speed (70mph+) only hits about 180. Never used to have this problem until they rebuilt the engine. I have replaced to thermostat twice with new OEM parts. No problems through the warmer months but keeps throwing a code saying it doesn’t get up to temp fast enough.

 

[Tremper126]

I wonder if your sensor could be out of range

 

[Northwoodspumper]

I wonder if your sensor could be out of range

I have thought that to but the oil temp goes up and down with the coolant temp.

 

[Tremper126]

Hmm. I wonder if they switched a hose somewhere and coolant is constantly flowing or if the fan never shuts off… I’m stumped

 

[Northwoodspumper]

Could it have something to do with the 3-way valve?

 

[Tremper126]

Possibly. Tcdiesel would have more insight on that.

 

[GearHead]

My 2014 did the same thing, I replaced the temp sending unit and it cleared up. However, there always has to be a however, my wife's GC is doing the same with a Code, replaced the sending unit no go still coding. So I guess I will go with a new thermostat. Or I can reinstall her GDE EPA tune which can use a lower temp thermostat to bypass the issue.