The expansion element is also the valve element of the thermostat and regulates the flow into the cooler.In closed condition, a small amount of ATF always flows GGThermostat openedCoverGGG = from or to gearboxK = from or to radiator KKS507_022PlungerKKS507_023 through the bypass as a result of which the expansionelement is warmed up.From a temperature of about 75 °C onwards, the plungerstarts to push the expansion element downwards againstthe spring force. This opens up the flow to the cooler (seenext fig.).The thermostat is fully open from a temperature of about90 °C onwards.
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