2003 Buick Regal Owner's Manual - Page 235

Cooling System When you decide it's safe to lift the hood, here's what you'll see: ... An electric engine cooling fan under the huud 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 recovery tank is boiling, don't do anything else until it cools down. The vehicle should be parked on a level surface. When the engine is cold, the coolant level should be at or above the COLD mark on the coolant recovery tank. A. Coolant Recovery Tank B. Electric Cooling Fans C. Radiator Pressure Cap 5-30