Does This Debunk the "Coolant Can Flow Through the Radiator Too Fast" Idea???
If you have an infinate amount of cold water supply, you can put any thermostat temp you want in there, and it will continue to run at thermostat temp, as the thermostat itself modulates the coolant flow.
Some of you seem to feel the thermostat opens fully at whatever temp, and stays fully open, - nonsense.
If the thermostat is full open all the time, how can cooling ability increase as more heat is created by "work". ie hill, load, ambient temp .
It doesn't, the wax pill in the stat modulates the opening to increase flow, as more heat is created in the coolant.
Thermostats generally fully open once coolant temp exceeds a few degrees over stat rating.
If you have a 180* stat, and engine runs 200, your system has no reserve to "work".
Years ago I tried to get overheat issues diagnosed with a heat gun or pyrometer at the top and bottom rad hose, suggesting the difference should exceed 50*, and that 30* be a very min., suitable for a " lawn tractor".
Then, I suggested folks go shoot the temps on their daily driver to compare, . (It'll be 50* +)
Some have understood.
If you can't get the radiator/coolant to shed enuff heat,
SOMETHING IS DEFICIENT.
Radiator ability/capacity, and/or airflow .
Once you get the radiator to shed 50 + *, you then likely need a thermostat to slow flow.
I have repeatedly tried to explain the thermostat modulates the opening to regulate flow thru an adequate cooling system to maintain the desired temp.
If you think the thermostat just "opens", - watch the video.