2005 Saturn Ion Owner's Manual - Page 247

Checking Intercooler System Coolant (2.0L L4 Engine Only) 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 5-30 for instructions on how to add coolant to the coolant surge tank and/or intercooler fill neck. {CAUTION: 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. 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. Notice: This vehicle has a specific coolant fill procedure. Failure to follow this procedure could cause your engine to overheat and be severely damaged. When replacing a pressure cap, make sure it is hand-tight and fully seated. Coolant Surge Tank Pressure Cap Notice: If the pressure cap is not tightly installed, coolant loss and possible engine damage may occur. Be sure the cap is properly and tightly secured. If you replace your coolant surge tank pressure cap, a Saturn cap is required. 5-27