Originally Posted By Evil Spirit
If the thermostat is closed, what difference does airflow through the radiator make? If the engine isn't up to thermostat opening temp, it shouldn't be circulating coolant through the radiator anyways, so changing airflow through through the radiator shouldn't affect coolant temps.


Most thermostats have a bypass port so a small amount of coolant is circulating all the time, and they typically start to open below their rated temperature.

'18 Ford Raptor, random motorcycles, 1968 Plymouth Fury III - 11.37 @ 118