Black plate (15,1)Cadillac ATS Owner Manual (GMNA-Localizing-Europe-6441895) - 2014 -CRC - 8/7/13Vehicle Care 10-151. Remove the coolant surge tankpressure cap from the topchamber when the coolingsystem, including the coolantsurge tank pressure cap andupper radiator hose, is nolonger hot.Turn the pressure cap slowlyanticlockwise. If you hear a hiss,wait for that to stop. This willallow any pressure still left to bevented out the discharge hose.2. Keep turning the pressure capslowly and remove it. Open thesurge tank service port cap tothe lower chamber3. Fill the surge tank top chamberwith the proper DEX-COOLcoolant mixture to the bottom ofthe fill neck. The top chamberneeds to be completely full. Fillthe surge tank bottom chamberthrough the service port toapproximately half.4. With the coolant surge tankpressure cap off and the surgetank service port cap open, startthe engine and let it run until youcan feel the upper radiator hosegetting hot. Watch out for theengine cooling fan.By this time, the coolant levelinside the coolant surge tank topchamber may be lower. If thelevel is lower, add more of theproper DEX-COOL coolantmixture to the surge tank topchamber until the level reachesthe bottom of the fill neck.5. Replace the surge tank pressurecap tightly and close the surgetank service port cap.{ CautionIf the pressure cap is not tightlyinstalled, coolant loss andpossible engine damage mayoccur. Be sure the cap is properlyand tightly secured.Check the level in the surge tanktop and bottom chambers when thecooling system has cooled down.If the coolant is not at the properlevels, repeat Steps 1–3 andreinstall the pressure cap and closethe service port. If the coolant still isnot at the proper levels when thesystem cools down again, see yourdealer.Engine OverheatingThe vehicle has a gauge and anindicator to warn of the engineoverheating. See Engine CoolantTemperature Gauge on page 5-11and Engine Coolant TemperatureWarning Light on page 5-20.If the decision is made not to lift thebonnet when this warning appears,get service help right away.If the decision is made to lift thebonnet, make sure the vehicle isparked on a level surface.
