How to Add Coolant to the IntercoolerSystem Fill Neck (4.4L V8 STS-VEngine Only)If you have not found a problem yet, turn the engine offand allow it to cool down, then check to see if coolantis visible within the horizontal tube section of thefill neck. If coolant is not visible, add a 50/50 mixture ofclean, drinkable water and DEX-COOL® coolant tothe fill neck. Be sure the Intercooler System, includingthe Intercooler System pressure cap, is cool beforedoing so. See Engine Coolant on page 5-27 for moreinformation.{CAUTION:Turning the Intercooler System pressure capwhen the engine and intercooler are hot canallow steam and scalding liquids to blow outand burn you badly. Never turn the IntercoolerSystem pressure cap, even a little, when theengine and intercooler are hot.{CAUTION:Adding only plain water to your coolingsystem can be dangerous. Plain water, orsome other liquid such as alcohol, can boilbefore the proper coolant mixture will. Yourvehicle’s coolant warning system is set for theproper coolant mixture. With plain water or thewrong mixture, your engine could get too hotbut you would not get the overheat warning.Your engine could catch fire and you or otherscould be burned. Use a 50/50 mixture of clean,drinkable water and DEX-COOL® coolant.Notice: In cold weather, water can freeze and crackthe engine, radiator, heater core and other parts.Use the recommended coolant and the propercoolant mixture.5-38
