Like the title says truck starts to go over 200 when on the highway, hitting the boost or pulling the trailer never had this problem before pulling the trailer in the past any suggestions??????

 

Quit driving 200?
What have you checked?

 

My bad 200 degrees had a small leak on the right side at that pesky rubber hose connection under the turbo fixed that and now its been doing that since then. coolant is full.

 

Could be some air trapped in the system.
I don't think the motors have a general overheating problem, infact its the opposite

 

Could be a faulty thermostat or a faulty temperature sensor. As stated they do not tend to over heat stock.

Did you have to add any make up after correcting the hose leak? Even air will get pushed out eventually.