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thanks fir the info. I’ve been reading that temperature fluctuations are normal, but I think this may be more than normal? It cycles every minute or so. I’ve been driving the truck for three years now, and it used to very slowly creep up toward operating range and just sit there without moving...

I replaced my thermostat and eventually water pump aft the truck but now the temperature gauge (which I believe to be accurate) fluctuates from the hot side of the safe operating range all the way to the cold side. The coolant system had a small mystery leak, which a mechanic told me is my...