Jeep Wrangler: STARTING THE ENGINE — DIESEL ENGINE (IF EQUIPPED) / Extreme Cold Weather

The engine block heater is a resistance heater installed in the water jacket of the engine. It requires a 110–115 Volt AC electrical outlet with a grounded, three-wire extension cord. Its use is recommended for environments that routinely fall below -10°F (-23°C). It should be used when the vehicle has not been running overnight or longer periods and should be plugged in two hours prior to start. Its use is required for cold starts with temperatures under -20°F (-28°C).

NOTE:

The engine block heater cord is a factory installed option. If your vehicle is not equipped, heater cords are available from an authorized Mopar® dealer.

  • A 12 Volt heater built into the fuel filter housing aids in preventing fuel gelling. It is controlled by a built-in thermostat.
  • A Diesel Pre-Heat system both improves engine starting and reduces the amount of white smoke generated by a warming engine.

    Automatic Transmission

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    Normal Starting

    Observe the instrument cluster lights when starting the engine. NOTE: Normal starting of either a cold or a warm engine is obtained without pumping or pressing the accelerator pedal...

    Other information:

    Jeep Wrangler 2018-2025 Owners Manual: Replacement Tires


    The tires on your new vehicle provide a balance of many characteristics. They should be inspected regularly for wear and correct cold tire inflation pressures. FCA strongly recommends that you use tires equivalent to the originals in size, quality and performance when replacement is needed...

    Jeep Wrangler 2018-2025 Owners Manual: Engine Check/Malfunction Indicator Warning Light (MIL)


    The MIL is a part of an Onboard Diagnostic System called OBD II that monitors engine and automatic transmission control systems. This warning light will illuminate when the ignition is in the ON/RUN position before engine start. If the bulb does not come on when turning the ignition switch from OFF to ON/RUN, have the condition checked promptly...

    Categories

    Bi-Level Mode

    Jeep Wrangler. Bi-Level Mode Air comes from the instrument panel outlets and floor outlets. A slight amount of air is directed through the defrost and side window demister outlets.

    NOTE:

    Bi-Level mode is designed under comfort conditions to provide cooler air out of the panel outlets and warmer air from the floor outlets.

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