1999 Cadillac Catera Owner's Manual - Page 131

yellowblue Engine Coolant Temperature Gage This gage shows the engine coolant temperature. If the gage pointer moves into the red area, the engine is too hot! Low Coolant Warning Light This warning light should come on for a few seconds while you are starting the engine. If the light doesn't come on, have it repaired. This reading means the same thing as the warning light -- the engine coolant has overheated. You should stop the car and turn the engine off as soon as possible. See "Engine Overheating" in the Index. Your vehicle is equipped with a low coolant level sensor (switch and float) that is designed to detect when your vehicle's coolant level drops below the set limit. If the low coolant level sensor (under the coolant surge tank) detects that the level drops while the engine is running, the low coolant indicator will light and remain lit until the ignition switch is turned off. Check the coolant level and add coolant as needed. The light should turn off as soon as the coolant level is at its proper operating range. 2-69