The truck was built from the ground up as a tow rig. As far as diesels go, it runs very cold. I have removed the fan for winter and the intercooler AND put in a solid piece of sheet metal closing the entire grill, and I taped my airfilter half closed. Helps, but I wanted to try a hot T-stat for winter. I'll put my 190 back in in the spring, or if the hot one decides it wants to try to melt my engine.
Brian