While waiting in line and the drive-ins I saw my temperature gauge rise and almost max out all the way on "H". I quickly cranked my heater all the way full blast to hurry and help cool the engine. The truck never started smoking or anything and ran fine and I paid and watched my movie. On my way home it was fine on freeway running normal and at stoplights etc its fine running normal temperature. What could have caused this? And my main question is: Do I need to worry about it?
My car has 121700 miles.
My car has an automatic transmission.
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