2009 Cadillac STS-V Owner's Manual - Page 219

Engine Coolant Temperature Gage This gage shows the engine coolant temperature. Tire Pressure Light For vehicles with a tire pressure light, this light comes on briefly when the engine is started and provides information about tire pressures and the Tire Pressure Monitoring System. When the Light is On Steady It can be used to see when the engine has warmed up and to make sure the cooling system is operating properly. If the gage pointer moves into the shaded area, the engine coolant is too hot and the engine coolant temperature warning light comes on. See Engine Overheating on page 5-34 for more information. This indicates that one or more of the tires is significantly underinflated. A tire pressure message in the Driver Information Center (DIC), can accompany the light. See DIC Warnings and Messages on page 3-79 for more information. Stop and check the tires as soon as it is safe to do so. If a tire is underinflated, inflate to the proper pressure. See Tires on page 5-54 for more information. 3-65