1999 Buick LeSabre Owner's Manual - Page 120

yellowblue Engine Coolant Temperature Warning Light This light will tell you that your engine coolant has overheated or your radiator cooling fans are not working. Engine Coolant Temperature Gage (If Equipped) If your vehicle is equipped with the gage cluster, you have a gage that shows the engine coolant temperature. If the gage pointer moves into the red area, your engine is too hot! If you have been operating your vehicle under normal driving conditions, you should pull off the road, stop your vehicle and turn the engine off as soon as possible. See "Engine Overheating" in the Index. That reading means the same thing as the warning light. It means that your engine coolant has overheated. If you have been operating your vehicle under normal driving conditions, you should pull off the road, stop your vehicle and turn off the engine as soon as possible. The engine coolant temperature gage indicates the coolant temperature in degrees Fahrenheit. The Canadian instrument panels indicate the coolant temperature in degrees Celsius. See "Engine Overheating" in the Index. 2-64