window that the operating mode of air refresh has been ended as a result of which the procedure is ended and started again from the beginning a dedicated air exchange function which exchanges the air in the passenger compartment with fresh air which is directed with an increased flow speed at vehicle occupants in particular onto their head and chest is made available by means of a flow of filtered external air possibly still with a certain portion of recirculation air users can easily start and stop the function in difficult situations e g in the case of hot humid external air the function can limit the external air supply to a value at which a sufficient air conditioning system operation is still possible i e without producing relatively warm air or exceeding the power limits of the air conditioning system when the function starts some or all of the following air conditioning settings are activated increased blower speed optionally or in particular as a function of the previously set blower speed the external air temperature and if appropriate the solar radiation lowered expulsion air temperature optionally or in particular as a function of the previously set expulsion air temperature the external air temperature and if appropriate the solar radiation selection of the active outlets for the expulsion air optionally or in particular as a function of previously selected outlets the external air temperature and if appropriate the solar radiation displaying of a screen menu which permits manual changing of parameters of the air exchange operating mode whether this be a changeover between various provided basic setting combinations or.