mysterious overheating Sugiere una traducción mejor

Ok. then 210°F is not bad, my car un it 50/50-water/antifreeze.
Now I see a problem, when the temperature reaches 210°F and remains so for some time, when the car is cold and remove the radiator cap, then I see that the level of coolant in the radiator is not the same now is low, the coolant not reach the radiator overflow tank, I dont see leaks anywhere, not oil in coolant or liquid on the oil dipstick..!