Patent ID: 7533718

Claim:
An air-conditioning device in a vehicle, comprising: climate sensor means for detection of outside temperature and dew-point, a control means for activation of air-conditioning means for a vehicle interior, and a navigation means for determining a vehicle position, wherein the control means is designed additionally for the activation of windowpane heating, exterior mirror heating, and a windshield wiper, and the navigation means sends a tunnel signal to an evaluation means at a predetermined time before arrival of a tunnel, wherein the evaluation means, to which data detected by the climate sensor means and relating to outside temperature and dew-point are communicated, has a comparison means which, in response to the tunnel signal from the navigation means, determines whether a detected outside temperature is lower than a detected dew-point temperature in the tunnel interior and, if so, outputs an information signal to the control means, and wherein the control means is designed in such a way that it switches on, directly upon tunnel entry, at least one of the windowpane heating, the exterior mirror heating, and the windshield wiper if the information signal from the comparison means informs it that the outside temperature is lower than the dew-point temperature in the tunnel interior and switches them off again at a predetermined time.