2009 Dodge Challenger Owner Manual SRT8 - Page 237

UNDERSTANDING YOUR INSTRUMENT PANEL 235 If Outside Ambient Temperature Is Less than 40°F Between 40°F and 80°F More than 80°F Mode Overrides To Mix No Override Bi-Level Temperature Overrides To Full Heat No Override Full Cool Rear Window Defroster Active Yes No No NOTE: • The feature can be disable by parking the vehicle with the blower control set to the "O" (or OFF) position. • For maximum performance, it is recommended that the vehicle is parked with the blower control set to the "High" (full clockwise) position. Operating Tips NOTE: Refer to the chart at the end of this section for suggested control settings for various weather conditions. 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. 4