2004 Ford Expedition Owner Guide 3rd Printing (Spanish) - Page 685

Maintenance and Specifications concentration testing is possible with a hydrometer or antifreeze tester (such as the Rotunda Battery and Antifreeze Tester, 014-R1060). The level of coolant should be maintained at the "FULL COLD" level or within the "COLD FILL RANGE" in the coolant reservoir. If the level falls below, add coolant per the instructions in the Adding engine coolant section. Your vehicle was factory-filled with a 50/50 engine coolant and water concentration. If the concentration of coolant falls below 40% or above 60%, the engine parts could become damaged or not work properly. A 50-50 mixture of coolant and water provides the following: • Freeze protection down to -34°F (-36°C). • Boiling protection up to 265°F (129°C). • Protection against rust and other forms of corrosion. • Enables calibrated gauges to work properly. When the engine is cold, check the level of the engine coolant in the reservoir. • The engine coolant should be at the "FULL COLD" level or within the "COLD FILL RANGE" as listed on the engine coolant reservoir (depending upon application). • Refer to the Scheduled Maintenance Guide for service interval schedules. • Be sure to read and understand Precautions when servicing your vehicle in this chapter. 301