"The engine is not supposed to be kept
'very  cool', it's designed to operate in a certain temperature range and
running  cool can ultimately result in damage just as well as running hot,
albeit  over a longer period of time."

Isn't this what the thermostat is supposed to fix?
~you start running too cool and it cuts off flow so you don't have to
worry about being too cold.

my [it's way too early to be awake] $.02

sudhir