Dear Friend
Look at the water temperature indicator (upper). The lower one is the oil temperature. When the engine is overheated, the radiator flaps in automatic mode are not open as much as possible. you can check: heating the engine in auto mode of hunting, then in manual mode open the radiator. and you will see that the radiator flaps are still open.
Problem is that the radiator in auto mode, with overheating, is not fully opened. I think that it works on the temperature of the oil, and not on the water temperature. but should open when the coolant is overheated!
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