A thermostat only controls the mimimun temperature of the cooling system and
allows for quicker warm ups. The quicker warm up comes from the water never
reaching the radiator until you reach the thermostat temperature. If the
ambient temperature is 32 F and you run a 160 thermostat you will probably
never get much above 160. On the other hand if the ambient temperature is
90F you probably will be running much higher- up around 190F. If you use a
190F thermostat you will maintain 190F even when the ambient temperature
drops to the thirties. All this is under ideal conditions.
My car has always run very hot (usually close to 212F) in any thing that
resembles warm weather. I have tried rebuilding the engine, oil coolers,
auxillary fans, Texas cooler, 6-blade Moss fan, various spark advance and
carburator settings and was never able to cool down my motor. Until this
year, when I had a new radiator built with two extra rows. Miraculously my
baby never goes over 200F even on 95F days when I run at sustained speeds of
70-75 MPH.
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