2011 Jeep Grand Cherokee Owner Manual - Page 336

334 UNDERSTANDING YOUR INSTRUMENT PANEL NOTE: In cold weather, use of Recirculation mode may lead to excessive window fogging. The Recirculation mode is not allowed in the Floor/Defrost Mix and Defrost modes to improve window clearing operation. Recirculation will be disabled automatically if these modes are selected. Operating Tips As the temperature gets colder, it may be necessary to direct air onto the windshield. Adjust the temperature control and blower speed to maintain comfort. Higher blower speeds will reduce fogging. Interior fogging on the windshield can be quickly removed by selecting the DEFROST mode. Regular cleaning of the inside of the windows with a non-filming cleaning solution (vinegar and water works Window Fogging very well) will help prevent contaminates (cigarette Windows will fog on the inside when the humidity inside smoke, perfumes, etc.) from sticking to the windows. the vehicle is high. This often occurs in mild or cool Contaminates increase the rate of window fogging. temperatures when it's rainy or humid. In most cases, turning the air conditioning (pressing the A/C button) on will clear the fog. Adjust the temperature control, air direction, and blower speed to maintain comfort.