2007 Saturn Ion Owner's Manual - Page 300

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. The coolant level should be at the cold fill line. If it is not, you may have a leak at the radiator hoses, heater hoses, radiator, water pump, or somewhere else in the cooling system. 2.2L L4 Engine shown, 2.4L L4 and 2.0L L4 Supercharged Engines similar A. Electric Engine Cooling Fan B. Coolant Surge Tank with Pressure Cap 300