2006 Saturn Ion Owner's Manual - Page 264

Checking Intercooler System Coolant (2.0L L4 Engine Only) Notice: This vehicle has a specific coolant fill procedure. Failure to follow this procedure could cause your engine to overheat and be severely damaged. Adding Coolant If you need more coolant, add the proper DEX-COOL® coolant mixture at the surge tank and/or intercooler fill neck, but only when the engine is cool. See Cooling System on page 5-31 for instructions on how to add coolant to the coolant surge tank and/or intercooler fill neck. {CAUTION: Park your vehicle on a level surface and turn off the engine. When your engine is cold, the coolant level should be just visible within the horizontal tube section of the fill neck. When your engine is warm, the coolant level could be as high as the FULL HOT line, or a little higher. The FULL HOT line has an arrow pointing down at it. You can be burned if you spill coolant on hot engine parts. Coolant contains ethylene glycol, and it will burn if the engine parts are hot enough. Do not spill coolant on a hot engine. When replacing a pressure cap, make sure it is hand-tight and fully seated. 5-28