Abstract: The invention provides a cooling system having an electrically adjustable control element for influencing the coolant temperature of internal-combustion engines in motor vehicles. The system according to the invention has an electronic controller which is connected in front of the control element and which, at least as a function of a quantity influenced by the coolant temperature, generates the control signal quantity for the control of the control element for reaching a desired coolant temperature. The parameters of the controller are determined by means of a basic characteristic diagram and at least one characteristic correction diagram.

Abstract: A cooling system for an internal-combustion engine of a motor vehicle having a radiator and a thermostatic valve by which the temperature of the coolant can be controlled in a warm-up operation, a mixed operation and a radiator operation. The thermostatic valve contains an expansion element which can be electrically heated for reducing the coolant temperature, the expansion element being designed such that the coolant temperature is set without heating the expansion element in the warm-up operation and/or in the mixed operation to an upper working limit temperature.