1996 Cadillac Eldorado Owner's Manual - Page 130

Engine Coolant Temperature Warning Light This red light tells you that the engine has overheated. You should stop the car and turn the engine off as soon as possible. A warning chime should also sound if this light comes on. Malfunction Indicator Lamp (Service Engine Soon Light) i SERVICE ENGINE SOON l 1 Your Cadillac is equipped with a computer which monitors operation of the fuel, ignition and emission control systems. As a check, thelight should come on for few seconds a when you start your engine. In the section "Problems on the Road," this manual explains what to do. See "Engine Overheating" in the Index. This system is called OBD I1 (On-Board Diagnostics-Second Generation) and is intended to assure that emissions are at acceptable levels for the life of the vehicle, helping to produce a cleaner environment. (In Canada, OBD I1 is replaced by Enhanced Diagnostics.) The SERVICE ENGINE SOON light comes on to indicate that there is a problem and service is required. Malfunctions often will be indicated by the system before any problem is apparent, which may prevent more serious damage to your vehicle. This system is also designed to assist your service technician in correctly diagnosing any malfunction. 2-69