I have been observing the coolant temperature for the past few days. With the shutters SHUT, at constant speeds, as soon as the coolant temp reaches 95-96C, it stabilizes and gradually drops to 91C. The cycle repeats every 5 minutes or so.
This leads me to consider that the Radiator fan is running on low speed and the trigger temp seems to be around 96C.
This is a good example why knowing when the radiator fan is ON is useful.
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