In simple terms, the thermostat determines whether the coolant will circulate or not. That is, it determines whether the coolant should flow through the small or large circuit (see also at the beginning of this chapter).
Naturally, the thermostat controls the flow of coolant depending on its temperature. This happens by means of a sleeve filled with special wax and a valve plate fixed on it. When the coolant is heated, the wax melts and expands and opens the valve plate. As long as the temperature of the coolant rises, the thermostat opens more and more access to cold water from the radiator. If the operating temperature, on the contrary, falls, then the spring in the thermostat again presses the valve disc into position «closed» («Zu»), thereby blocking access to cold water until the operating temperature is reached.
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