Black plate (27,1)Cadillac STS Owner Manual - 2011Checking CoolantThe vehicle must be on a level surface when checkingthe coolant level.The coolant surge tank and pressure cap are located onthe driver's side of the vehicle, toward the rear of theengine compartment. See Engine CompartmentOverview on page 6‑13 for more information onlocation.Check to see if coolant is visible in the coolant surgetank. If the coolant inside the coolant surge tank isboiling, do not do anything else until it cools down.If coolant is visible but the coolant level is not at orabove the FULL COLD/FROID line, add a 50/50 mixtureof clean, drinkable water and DEX-COOL ® coolant atthe coolant surge tank, but be sure the cooling systemis cool before this is done.When the engine is cold, the coolant level should be ator above the FULL COLD/FROID line on the side of thecoolant surge tank. Follow the arrow from the top of thetank down the side to the horizontal mark. If it is not,there could be a leak in the cooling system.If the coolant is low, add the coolant or take the vehicleto a dealer for service6-27
