1998 Cadillac DeVille Owner's Manual - Page 144

Engine Coolant Temperature Gage Analog Cluster This gage showsthe engine coolant temperature. If the gage pointer moves into the red area, the engine is too hot. That reading means the same thing as warning the light -- the engine coolant has overheated.In the section "Problems on the Road," this manual explains what to See do. "Engine Overheating" in the Index. Malfunction Indicator Lamp (Service Engine Soon Light) SERVICE ENGINE SOON Your vehicle is equipped with a computer which monitors operationof the fuel, ignition and emission control systems. This system is called OBD (On-Board II Diagnostics-Second Generation) andis intended to assure that emissions are at acceptable levels the life for of the vehicle, helping to produce a cleaner environment. The SERVICE ENGINE SOON light comes on and a chime will sound to indicate that is there a problem and service is required. Malfunctions often any will be indicated by the system before problem is to apparent. This may prevent more serious damage your vehicle. This system also designedto assist your is any service technician in correctly diagnosing malfunction. 2-73