Climate control 105Air recirculation modeDuring ’normal’ operation, the hea ting,ventilation and a ir cond itioning systemuses outside air. To prevent fumes orunpleasant odours from entering thevehic le when in stationary traffic and whenrapid heating or cooling of the passengercompartment is required, press button 4;control indica tor in the button illuminatesand air is recircula ted.Air recircula tion mode should only be usedfor b rief periods, d ue to gradualdeterioration in air quality and an increasein humidity , causing windows to mist up.Driv ing with air recirculation mode on forextended periods may cause vehicleoc cup ants to feel drowsy.Press button 4 a g ain to turn airrecirculation mode off; control indicator inthe button ex tinguishes and outside air isdrawn into the vehicle.Air conditioning systemAs a supplem ent to the heating andventila tion system , the a ir cond itioningsystem cools and dehumidifies (dries)inflowing a ir and removes dust a nd p ollen,to provide ma ximum comfort under anyweather conditions.If c ooling or dehum idific ation is notrequired, switc h off cooling in order to sav efuel.