2007 Cadillac CTS-V Owner's Manual - Page 200

Engine Coolant Temperature Warning Light (CTS) This light will come on when you first start the vehicle as a check to let you know that the light is working. Engine Coolant Temperature Gage This gage shows the engine coolant temperature. If the gage pointer moves into the shaded area, the engine is too hot. It will go out after a few seconds. If the light does not come on, see your GM dealer. If the light does not go out or if the light comes on and stays on while you are driving, your vehicle may have a problem with the cooling system. You should stop the vehicle and turn off the engine as soon as possible to avoid damage to the engine. A warning chime will also sound when this light is on. See Engine Overheating on page 360 and Message Center (CTS-V) on page 209 for more information. That reading means the same thing as the warning light - the engine coolant is very hot. See Engine Overheating on page 360. 200