The invention relates to an air deflector device for an air conditioning system in a motor vehicle. The air deflector device has at least one closure element and at least one air mixing element. The closure element and the air mixing element have a common rotational axis in the air deflector device. The closure element extends in the direction of the rotational axis across the entire depth of a cross-section of a flow passage to be closed off in the air conditioning system, and comprises retaining elements.The air mixing element, which extends in the direction of the rotational axis, is embodied according to the invention with cross-flow openings, so that a cross-section of at least one flow passage of the air conditioning system can be adjusted based on the position of the air deflector device.