2013 Jeep Grand Cherokee Owner's Manual - Page 431

UNDERSTANDING YOUR INSTRUMENT PANEL 429 NOTE: In cold weather, use of Recirculation mode may lead to excessive window fogging. The Recirculation mode is not allowed in the Defrost modes to improve window clearing operation. Recirculation will be disabled automatically if Defrost is selected. Operating Tips Window Fogging Windows will fog on the inside when the humidity inside the vehicle is high. This often occurs in mild or cool 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. 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 very well) will help prevent contaminates (cigarette smoke, perfumes, etc.) from sticking to the windows. Contaminates increase the rate of window fogging. Summer Operation NOTE: In some cases during high temperature trailer tow operation the Air Conditioning system performance may be reduced. This is to help protect the engine from overheating during the high load condition. 4