I have a 2011 Laramie 6.7 G56 and deleted. Since the weather turned cooler (30's) the engine temperature takes forever to reach 200*. I commute 19 miles to work mostly secondary highways up and down hills. After 12 miles of mostly uphill my temp will be at 190*. The rest of the trip is mostly downhill and I will drop to 165*. For the entire trip home I will finally be at 185* when I pull in my driveway with never reaching 200*. I monitor the temp with both the factory gauge and my MiniMaxx.
I know it sounds like a thermostat problem but here is what I did last night. I pulled the thermostat and put it in a pot of water on the stove with a thermometer to monitor water temperature and thermostat opening temperature. Stat didn't begin to open until thermometer reached 200* so stat tested OK. I reinstalled the stat, refilled with coolant, completely blocked the front of the radiator with cardboard, and went for a ride. In about 10 miles I was up to 190*. I pulled into my garage, lifted the hood and felt the upper radiator hose...it was just beginning to get warm.
My 2001 HO Cummins NV5600 was similar.
My 2011 is deleted and I am running AMSOIL HDD 5W-30 HD diesel oil.
Anyone else have similar experiences? I have asked several friends with similar trucks for their temps, 2 friends with automatics stock say 5-6 miles they are up to temp, 1 with a G56 says very slow warming up 10-12 miles. Thanks...

 

2005 and a 2001, I can drive 10 miles and still be under 165. If I stop they will cool down. The 2001 has a new T-stat and the 2005 has only 30k on it. The colder it gets the more they do it. Now pull a load and they will heat right up. Just the way they are. Put a winter cover on it, helps alot.

 

Same here with a load...heats right up. I guess that is the nature of the beast!!! Now my wife's Liberty CRD is up to temp in 2 miles...even in the winter. I do have the factory winter cover which will go on once the temps stay consistently cold.

 

sounds like my '08 after I did the deletes on it. Shutting off the egr takes a lot longer to heat up.

jeff.

 

normal. I only get up to 195 on the freeway at 80mph and it takes forever to get to that temp. going to be installing the winter front here soon but going to wait til the temps are consistently below the 50* mark

 

Putting my winter front coat on in the morning. Any hints or problems to watch out for?

Larry

 

Larry,
I have a winter front on my 08, and the only time I worry about the front being on the truck is when the ambient air temps are over 60 F. I tend to watch the temp gage to see if there is a lot of temperature fluctuation in the coolant. Such as the coolant reaches 200/205F then drops to under 190F and then right back to 200/205F. If this is happening then the winter front is blocking to much cool air to the radiator and the winter front needs to be removed.
When the air temps are under 60 F and above 20F day time high the four flaps are open. I start closing off the flaps as the day time temps creep lower until they are all closed off around -20F. I also start plugging in the truck around 20F at night just to help with an easier starting in the morning. The block heater is on a timer and will turn on around 5:00 AM and then off at 7:00 AM each morning.
Jim W.

 

Plug in truck and put the winter front on. I leave all the flaps closed. The truck warms up in half the distance. On the winter front I tucked the bottom part up under the top part. That seems to allow plenty of cooling if the outside temp rises.
I want the truck to warm up as quick as possible.