Abstract: A ventilation device for ventilating the interior of a motor vehicle, and a method therefore, in which sensor for determining at least one parameter reflecting the degree of glass condensation is used to determine whether to maintain the vehicle ventilation system in recirculation mode during the actuation of a windshield and/or headlight washer, or to switch to a fresh air mode. In response to the sensor signals, an evaluation device generates a signal for at least temporarily switching to fresh air mode when a parameter value exceeds a predefined value, or generates a time period for a residence time to be observed in recirculation air mode.

Abstract: A ventilation device for ventilating the interior of a motor vehicle, and a method therefore, in which sensor for determining at least one parameter reflecting the degree of glass condensation is used to determine whether to maintain the vehicle ventilation system in recirculation mode during the actuation of a windshield and/or headlight washer, or to switch to a fresh air mode. In response to the sensor signals, an evaluation device generates a signal for at least temporarily switching to fresh air mode when a parameter value falls below a predefined value, or generates a time period for a residence time to be observed in recirculation air mode.