Jeep Wrangler Owner's Manual

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Extreme Cold Weather (Below –20°F Or –29°C)
To ensure reliable starting at these temperatures, use of an externally powered electric engine block heater (available from your authorized dealer) is recommended. ...

Engine Coolant Checks
Check the engine coolant (antifreeze) protection every 12 months (before the onset of freezing weather, where applicable). If the engine coolant (antifreeze) is dirty or rusty in appearance, the s ...

Normal Starting
NOTE: Normal starting of either a cold or a warm engine is obtained without pumping or pressing the accelerator pedal. Turn the ignition switch to the START position and release when the engine sta ...