2003 Pontiac Grand Prix Owner's Manual - Page 262

When the engine is cold, the coolant level should be at or above the COLD mark on the coolant recovery tank. 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. If it isn't, you may have a leak at the pressure cap or in the radiator hoses, heater hoses, radiator, water pump or somewhere else in the cooling system. 5-37