Years ago, the only mechanism for controlling engine-coolant temperature was a thermostat containing a pellet of brass and wax that had to melt so coolant could travel between the engine and radiator.
Today, vehicles manage the coolant temperature – and, ultimately, the temperature of the combustion chamber – via electronically controlled thermostats, electric water pumps and, now, active grille shutters.
This video is sponsored by the Automotive Distribution Network.