2004 Jeep Wrangler Owner's Manual - Page 154

154 UNDERSTANDING YOUR INSTRUMENT PANEL NOTE: For improved safety, the A/C compressor is activated when "Mix" or "Defrost" modes are selected. This is done to assist in drying the air and it will help in keeping the windshield from fogging. Operating Tips 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. Winter Operation The air from the heater system will heat faster in cold weather if you use lower blower speeds until the engine warms up. REAR WINDOW FEATURES - HARD TOP ONLY Rear Window Defogger To turn the rear window defogger on, press the rocker switch. If you press the switch a second time, you will turn the defogger off. A light on the rocker switch will indicate the defogger is on. The defogger will automatically turn off after about ten minutes. For five more minutes of operation, depress the top of the switch to turn the defogger on again. To prevent excessive battery drain use the defogger only when the engine is operating.