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it is true ... until the thermostat functions no cooling water will flow to the radiator ..
in the case of my machine i have a 195 in .. so until the temp of the water in the block reaches 195 the radiator is not in function..
in winter one often will put a block on to keep the temp up to operating temps
we always used cardboard or *winter covers * over the radiator..
modern machines have various artifices to increase temperatures
to me modern is a 1980 .. they had stoves and flappers {WAI -warm air induction }
to increase induction temps in order to reduce emissions
i have seen no indisputable results indicating that hot induction reduces MPG..
however . with my machine/test set i could easily test that ..
be advised my machine runs all analogue .. no computers .. the most complex electronic device is the alternator..
with newest machines [this century]they have some complex sensing circuitry and WAI or hot intake *might * trick the logic's to reducing the fuel flow
im not sure about any of that .. like i said i run analog and ya ain't trickin that
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