2004 Chrysler Concorde Owner Manual - Page 212

212 MAINTAINING YOUR VEHICLE Higher concentrations (not to exceed 70%) may be used if temperatures below -37°F (-38°C) are anticipated. Use only high purity water such as distilled or deionized water when mixing the water/antifreeze solution. The use of lower quality water will reduce the amount of corrosion protection in the engine cooling system. NOTE: Mixing coolant types will decrease the life of the engine coolant and will require more frequent engine coolant changes. Please note that it is the owner's responsibility to maintain the proper level of protection against freezing according to the temperatures occurring in the area where the vehicle is operated. Cooling System Pressure Cap The cap must be fully tightened to prevent loss of coolant, and to insure that coolant will return to the radiator from the coolant reserve tank. The cap should be inspected and cleaned if there is any accumulation of foreign material on the sealing surfaces. WARNING! The warning words "DO NOT OPEN HOT" on the cooling system pressure cap are a safety precaution. Never add coolant when the engine is overheated. Do not loosen or remove the cap to cool an overheated engine. Heat causes pressure to build up in the cooling system. To prevent scalding or injury, do not remove the pressure cap while the system is hot or under pressure. WARNING! Do not use a pressure cap other than the one specified for your vehicle. Personal injury or engine damage may result.