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During the cold start of an IC engine, the water temperature and particularly the oil sump temperature rises slowly depending on the outside ambient temperature. At the same time, the engine consumes more gasoline and emits more pollutants in the form of CO, HC, NOX. The thermal comfort in the passenger compartment is also poor. To avoid or minimize some of these problems, Valeo Engine Cooling is developing a new, economical system, the Insulated Expansion Tank (IET), which makes it possible to instantaneously heat the engine coolant by sensible heat from the IET, the volume of this tank has been increased especially for this application. The component actually has two functions: 1. Allows for expansion and degassing of the cooling circuit 2. Thermal storage of sensible heat The IET is installed in the engine cooling circuit according to figure 1.