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Fan will kick in at 220. Mine usually kicks in at about 215. But yes my experience is mil gauges are not always accurate. Sent from my SM-J727U using Tapatalk

There is one more way to check the Thermostatic switch. Pull it out and clean it up.. reinstall it.then see if it opens. Sent from my SM-J727U using Tapatalk

I knew how to check the 12338599 Switch, Thermostatic Fan. But the realty was just easier to replace due to cost. I am curious what the TCM(Transmission Control Module) has to do with this. There is also a part number 12338603 Module, Time Delay, Hydraulic Cooling Fan, that connects to the...

Make sure all the air is out of the coolant lines. Since truck sat higher then the back. Sounds like there might be an air pocket near the thermostat. Next if been realy cold and the truck been sitting. Take a hair drier and run it blowing on the Cadillac valve. There is a possibility that...