When driving at 75 mph the engine generates a certain amount of heat,
but at the same time the speed forces air through the radiator,
providing sufficient cooling capacity.
When suddenly stopping, the air flow stops, thereby decreasing
decreasin cooling capacity drastically before the engine gets rid of
all the generated heat , which leads to the rise in temperature.
The rise in temperature is high, it should switch on the fans to
provide more cooling capacity. When moving down the road, airflow
starts in any case to provide more cooling.
So, the situation is not necessarily unusual.
But it could indicate a cooling capacity problem, which could be caused
either by reduced water flow in the cooling system or by corroded
cooling fins of the radiator (not unusual.. I have tried it with two
I don't know the steering system of your specific car. But if the
problem is connected whith the above situation at all, the only thing I
can think of is the cooling (or lack of it) of the servo oil. I do
however not have particular experience with it.