If you have a temperature gauge it should stay at or just below the middle when the vehicle is fully warmed up. Slight (very slight) fluctuation on the gauge is normal. This is all dependant upon having proper flow of coolant through your coolant system. If, for instance, your water pump is broken, there is no flow of fluid acros the temperature sensor, thereby giving you a false reading. The temperature sensors in the car need the fluid to flow across the sensor to give a true reading. When the car is fully warmed up, squeeze the top radiator hose hard a few times. You should feel moderate resistance and then you should feel the surge of coolant back through the hose as you release it. If you dont, your water pump may have quit working or you have a sizeable blockage in your coolant system.,
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