2011 Ford F350 Super Duty Crew Cab Owner Guide 4th Printing - Page 376

Maintenance and Specifications 60%, the engine parts could become damaged or not work properly. A 50/50 mixture of coolant and water provides the following: • Increased freeze point suppression • Increased boiling point. • Protection against rust and other forms of corrosion. • Proper function of calibrated gauges. 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 or MIN / MAX range as listed on the engine coolant reservoir (depending upon application). • Refer to scheduled maintenance information for service interval schedules. If the engine coolant has not been checked at the recommended interval, the engine coolant reservoir may become low or empty. If the reservoir is low or empty, add engine coolant to the reservoir. Refer to Adding engine coolant in this chapter. Note: Automotive fluids are not interchangeable; do not use engine coolant/antifreeze or windshield washer fluid outside of its specified function and vehicle location. Adding engine coolant When adding coolant, make sure it is a 50/50 mixture of engine coolant and distilled water. Add the mixture to the coolant reservoir, when the engine is cool, until the appropriate fill level is obtained. If coolant is filled to the COLD FILL RANGE or FULL COLD level when the engine is not cool, the system will remain underfilled. WARNING: Do not add engine coolant when the engine is hot. Steam and scalding liquids released from a hot cooling system can burn you badly. Also, you can be burned if you spill coolant on hot engine parts. 376 2011 F-250/350/450/550 (f23) Owners Guide, 4th Printing USA (fus)