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 solution of 50% ethylene glycol antifreeze coolant and 50% water is recommended.

Refer to “Maintenance Procedures” in “Maintaining Your Vehicle” for proper coolant selection.

    See also:

    Cooling System Pressure Cap
    The cap must be fully tightened to prevent loss of engine coolant (antifreeze), and to ensure that engine coolant (antifreeze) will return to the radiator from the coolant recovery tank. The ca ...

    Smooth, quiet ride
    But most people won't get out into the wild with the Unlimited and they'll enjoy it just the same on the highway. Jeep added a few acoustic improvements to make the ride quieter, though those are ...

    Traction Control System (TCS)
    This system monitors the amount of wheel spin of each of the driven wheels. If wheel spin is detected, brake pressure is applied to the slipping wheel(s) and engine power is reduced to provide e ...