It does occur to me the temperature sending unit may not be accurate. The numbers it does send are consistent. I ay try installing a new temp sensor at some point. One thing it may do if indeed the sending unit is providing low temp numbers, is to register higher numbers which would give the computer proper information which my cause the engine to run differently. It could also kick the fan to lockup, something I have never seen happen without using the blue wire switch. The doubt of whether the thermostaat is in error is that the truck runs at 185, the thermostat rating, when at 65 or 70 mph. Time will tell. for now, I'm very happy with the running temperature the engine has now. No worries up to 70 and after 75, I need to be observant going up long grades for progressing temperatures to prevent coolant from being vented out. Further updates as they get figured out.
