This is from the Stewart Components tech pages:
A common misconception is that if coolant flows too quickly through the
system, that it will not have time to cool properly. However the cooling system
is
a closed loop, so if you are keeping the coolant in the radiator longer to
allow it to cool, you are also allowing it to stay in the engine longer, which
increases coolant temperatures. Coolant in the engine will actually boil away
from critical heat areas within the cooling system if not forced through the
cooling system at a sufficiently high velocity. This situation is a common
cause
of so-called "hot spots", which can lead to failures.
Best,
Henry Vicioso
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