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Thermostats? There is only one for the engine… the 6X tractors with the auxiliary transmission coolers have a thermostatic control valve in the oil plumbing that decides if it wants to send fluid to the secondary cooler found on those tractor models, but the 4X4s only have an engine...

I doubt the winch is blocking much, as there is plenty of room for air to get around in behind under the intercooler. These trucks have horrible natural rolling/ram airflow and the fan is a necessity when you are making heat. With the truck turned off, the fan should be locked and you should...

Fan should kick on at 205F.

Yea that sounds about right for a 3116. It basically sends all the engine heat to the transmission. Below about 65F outside air temp, Untill the transmission warms and starts generating heat, the engine wont even get warm enough to open the thermostat. You can see thw cold weather radiator...

Most diesels are happiest approaching 200F. Maintaining a temp above the thermostat opening point(178F) is good as it means it is controlling temp with a steady coolant flow thru the radiator. Thats a good thing. That being said The way they plumbed the 3116 makes it notoriously cold...