2006 Jeep Grand Cherokee Owner's Manual - Page 244

244 UNDERSTANDING YOUR INSTRUMENT PANEL This button can be used to block out smoke, odors, dust, high humidity, or if rapid cooling is desired. The recirculation mode should only be used temporarily. The button includes an LED that illuminates, which indicates that the recirculation mode is active. You may use this feature separately. NOTE: Extended use of recirculation may cause the windows to fog. If the interior of the windows begins to fog, press the "Recirculate" icon button to return to outside air. Some temp./humidity conditions will cause captured interior air to condense on windows and hamper visibility. For this reason, the system will not allow "Recirculate" to be selected while in the defrost or defrost/floor modes. Attempting to use the recirculation while in these modes will cause the LED in the button to blink and then turn off. Summer Operation The engine cooling system in air conditioned vehicles must be protected with a high-quality antifreeze coolant to provide proper corrosion protection and to protect against engine overheating. A 50% solution of ethylene glycol antifreeze coolant in water is recommended. Refer to "Maintenance Procedures" in Section 7 of this manual for proper coolant selection. Winter Operation Use of the air Recirculation mode during winter months is not recommended because it may cause window fogging. NOTE: Refer to the "Operating Tips" chart (for Manual A/C Control) in this section for suggested control settings in different weather conditions.