2003 Ford Expedition Owner Guide 5th Printing - Page 15
2003 Ford Expedition Manual
Page 15 highlights
Instrument Cluster GAUGES Engine coolant temperature gauge Indicates the temperature of the engine coolant. At normal operating temperature, the needle remains within the normal area (the area between the "H" and "C"). If it enters the red section, the engine is overheating. Stop the vehicle as soon as safely possible, switch off the engine immediately and let the engine cool. Refer to Engine coolant in the Maintenance and specifications chapter. Never remove the coolant reservoir cap while the engine is running or hot. Steam and scalding liquid from a hot cooling system can burn you badly. This gauge indicates the temperature of the engine coolant, not the coolant level. If the coolant is not at its proper level the gauge indication will not be accurate. If the gauge enters the red section, the oil pressure/engine coolant and Check Engine/Service Engine Soon indicators illuminate, refer to What you should know about fail-safe cooling in the Maintenance and specifications chapter. 15