Normal behavior. In traffic (which I sit in alot...) the fans cycle and that determines the coolant temperature. In my case the needle cycles between the front and back side of the '0' in 180 as the fans cycle on and off. When driving at highway speeds my temps fall and the needle will settle below the '8'. It is always above the mark at 180, just how my gauge is. Rads are relatively clean and both fans work fine.
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