Simply put, the thermostat is designed to determine whether it is necessary to cool the liquid in the radiator or not, i.e. it «decides» about whether the coolant should circulate through «small» or by «big» circle, as already mentioned at the beginning of the chapter.
The thermostat regulates the flow of coolant depending on its temperature. As the coolant temperature rises, the thermostat increases the flow of cold fluid from the radiator. Conversely, if the operating temperature drops, the thermostat spring pushes the valve disc back into position «closed» (German «Zu») and thus shuts off the coolant coolant supply until the operating temperature rises again.
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