2008 Cadillac CTS Owner's Manual - Page 315

Cooling System When you decide it is safe to lift the hood, here is what you will see: {CAUTION: An electric engine cooling fan under the hood can start up even when the engine is not running and can injure you. Keep hands, clothing, and tools away from any underhood electric fan. If the coolant inside the coolant surge tank is boiling, do not do anything else until it cools down. The vehicle should be parked on a level surface. A. Electric Engine Cooling Fans (Out of View) B. Coolant Surge Tank and Pressure Cap 5-33