Sounds like a loose connection at the coolant temperature sender. Or, the truck is low on coolant and air bubbles are passing by the sensor. This, along with a gurgling heater core, is a classic symptom of coolant that is too low before the truck overheats. Paying attention to these clues allowed me to fill up a friend's truck with coolant as it was almost a gallon low, and he didn't even know it was leaking (Dexcool). If you are losing coolant, you may have an intake leak. It is a common problem around 65 to 80 thousand miles. I would have this checked, you most likely won't see a leak, unless you look from below by the back of the intake. It ususally drips out there.
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