Abstract: A method for controlling a cooling system for cooling a heat generating device, the method comprising the steps of determining cooling capabilities of the cooling system as a temperature decrease that can be achieved by the cooling system alone while the heat generating device operates in constant conditions after reaching a maximum temperature at the constant ambient conditions; determining an activation temperature; measuring the temperature of the heat generating device; switching the cooling system on when the measured temperature reaches the activation temperature; defining a deactivation temperature which is smaller by a threshold value than the activation temperature minus the cooling capabilities; switching the cooling system off when the measured temperature reaches the deactivation temperature