2008 Jeep Wrangler Owner's Manual - Page 263
2008 Jeep Wrangler Manual
Page 263 highlights
262 UNDERSTANDING YOUR INSTRUMENT PANEL Panel Air is directed through the outlets in the instrument panel. These outlets can be adjusted to direct airflow. Bi-Level Air is directed through the panel and floor outlets. NOTE: There is a difference in temperature between the upper and lower outlets for added comfort. The warmer air goes to the floor outlets. This feature gives improved comfort during sunny but cool conditions. Floor Air is directed through the floor outlets and side window demist outlets with a small amount through the defrost outlet. Mix Air is directed through the floor, defrost and side window demist outlets. This setting works best in cold or snowy conditions that require extra heat at the windshield. This setting is good for maintaining comfort while reducing moisture on the windshield. Defrost Air is directed through the windshield and side window demist outlets. Use this mode with maximum fan and temperature settings for best windshield and side window defrosting. NOTE: The air conditioning compressor operates in both Mix and Defrost or a blend of these modes even if the fan switch is not in the A/C position. This dehumidifies the air to help dry the windshield. To improve fuel economy, use these modes only when necessary.