2005 Saturn Ion Owner's Manual - Page 246

Checking Coolant {CAUTION: Turning the surge tank pressure cap when the engine and radiator are hot can allow steam and scalding liquids to blow out and burn you badly. Never turn the surge tank pressure cap - even a little - when the engine and radiator are hot. The vehicle must be parked on a level surface. When your engine is cold, the coolant level should be near the cold fill line. When your engine is warm, the level should be at the cold fill line or a little higher. The surge tank is located on the driver's side of the engine compartment. See Engine Compartment Overview on page 5-12 for more information on location. If the COOLANT warning message comes on and stays on, it means you are low on engine coolant. See Low Coolant Level Warning Message on page 3-41. 5-26