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search on temperature and overheating here on this forum. There are a couple of good threads about it.
My box did the same as yours, and I found it was the primary fan... it had burned out. At high speeds it was at normal operating temps (needle stays between the 8 and the 0 in the "180" due to sufficient wind blowing over the radiator. In traffic, it would climb, but not to overheating levels.
The next time it's running hot, park it with the engine running and walk to the front of the car (AC blowing too, BTW). You should be able to put your hand below the bumper in front of both front tires and feel very hot air blowing downward. If you don't feel it on one side or the other, you have a fan out or the thermostat that controls each fan is out.
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