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To be honest the behaviour is surely exactly what is expected. When moving, the rad is being force-cooled by the air moving through it, so the temp stays at whatever the thermostat is regulating at. Then, when not moving there is a very large drop in air-flow, so the temperature is bound to rise. This continues until the temp switch kicks in and turns on the fans. This draws air through the rad causing a cooling effect. Once the temp in the rad core drops to below the limit set by the temp switch the fans are switched off.
This behaviour then continues depending on your driving situation. It is also dependant on outside air-temp and things like blocked air intakes, clogged rad cores, etc. But, I think what you are seeing is quite normal. If the gauge regularly goes too high then you do need to look at the temp switch.
Hope that helps..
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