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normal operation is 194-206, 206+ until thermostat opens or under high engine load &/or extreme temperatures. The reason for the high temp is for efficient fuel combustion & emission control. With that said, I have installed a 180 degree thermostat after my deletes were complete, no reason to have a Diesel engine run that hot if not needed. Without starting a dispute, everyone has there own opinion, I have not noticed any performance increase or decrease, but with hot summer temps, it keeps me sane that my coolant stays around 182-185 during everyday driving.. A temperature I feel at much more ease with
 

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Can you get the 180 or 190 thermostat at the local parts store?
Napa auto parts

Part number 375-180 = 180 degree

If you call your local auto parts store there going to say 190 is what te factory calls for, but if you have a local napa, the above part number for the 180 will fit the 6.7 cummins
 
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Just put one in my sig 12... Had one in my last 12 and worked great pulling and DD in Texas heat... Stays at 183
 

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Discussion Starter #25
I will change mine when I do my turbo swap.
 

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Mine will get up to 210-212 then open the first time. Then it'll float between 199-206.

I picked up a 190 thermostat at cummins southern plains a couple days ago just haven't put it in yet.
 

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In a previous thread, it was the general consensus was if you are stock you need to leave the 200 degree stat in it. Deleted, do what you want.

My stock '12 runs about 204 or so. When towing heavy and slow, when I get to 217 the fan turns on and it pulls down to 200 quickly. So, normal is 200-217.
 
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high coolant temperature HELP

I have a 2010 6.7 with a g56 tranny. And my coolant temp is always running hot about 208 to 213 cruising empty on highway @ 70. I was recently pulling a boat hrough Utah and temperature spike to 220 to 230 at that point I started blasting the heat and trying to get the temperature down. Will not engage fan full speed unless the air conditioning is on. do you think that I have a thermostat problem? Please help.
 

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Discussion Starter #31
That sounds like something else.
 

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I live in SETX and havent seen mine reach temps over 202 to 203. All stock. Usually keep the evic on temp gauge.
 

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I think i have a t-stat sticking open. My 11 that is all stock will get to around 190 then drop to around 183 running interstate @ 70mph and stay there. It throws good heat so i dont know whats going on. Could it be that the sensor is off by 10 or 15 degrees. I would think if it was stuck open the temps would run around 140 to 150
 

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truck in sig runs 200-204 on average I did see 217 hauling a 6700# toy hauler up a long steep grade not to long ago runnin 75 mph.
 

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truck in sig runs 200-204 on average I did see 217 hauling a 6700# toy hauler up a long steep grade not to long ago runnin 75 mph.
No matter stock or deleted, running 75mph pulling 6500+ up a steep grade, Dodge/Ram CUMMINS started this in the lite duty truck segment. There was no way in he double L this was going to happen with the naturally aspirated 6.2 or 6.9IDI. Just saying.:cbadge: Thanks for sharing, Hope its a simple answer for the OP. Definitely not motor threatening. Keep it simple.:thumbsup:
Yes I have had a couple. Long day. Haha:beer
 

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I just ordered a MOTORAD 426190 (426-190) thermostat for my truck. Here lately my truck will reach as much as 212f before the thermostat opens. I am inclined to believe the thermostat is sticking because it used to open sooner. For peace of mind I'm going with a 190 because normal operating temp of 204f just seems hot.
 

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Indiana to albany ny towing 29ft. t/t, temp stayed at 201 for most of the trip.
 

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Towing our 35ft toyhauler, id say is 12-13k. It will hit 210-212 then drop back and hang around 205. Without the toyhauler it is running between 198-206.


Sent from AutoGuide.com Free App
 

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Mine will hit 206/208 then the T-stat opens up, drops to 195. Normal temp on these is 198-206.I wouldn't worry until you see 220+
 
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