2010 Cadillac STS Owner's Manual - Page 388

4. With the coolant surge tank pressure cap off, start the engine and let it run until you can feel the upper radiator hose getting hot. The upper radiator hose is the largest of the hoses which comes out of the radiator, on the passenger side of the vehicle. Watch out for the engine cooling fans. By this time, the coolant level inside the coolant surge tank may be lower. If the level is lower, add more of the proper mixture to the coolant surge tank until the level reaches the FULL COLD/FROID line on the side of the coolant surge tank. 5. Then replace the pressure cap. Be sure the pressure cap is hand-tight and fully seated. Start the engine and allow it to warm up. If the engine is overheating, then you will find a coolant temperature gage and a coolant warning light on the instrument panel. See Engine Coolant Temperature Gage on page 4‑61 and Engine Coolant Temperature Warning Light on page 4‑61 for more information. You may decide not to lift the hood when this warning appears, but instead get service help right away. See Roadside Service on page 8‑8. If you do decide to lift the hood , make sure the vehicle is parked on a level surface. Then check to see if the engine cooling fans are running. If the engine is overheating, both fans should be running. If they are not, do not continue to run the engine and have the vehicle serviced. Notice: Engine damage from running your engine without coolant is not covered by your warranty. See Overheated Engine Protection Operating Mode on page 6‑34 for information on driving to a safe place in an emergency. Notice: If the engine catches fire while driving with no coolant, the vehicle can be badly damaged. The costly repairs would not be covered by the vehicle warranty. See Overheated Engine Protection Operating Mode on page 6‑34 for information on driving to a safe place in an emergency. Engine Overheating The vehicle has several indicators to warn of engine overheating. There are two engine hot messages that could be displayed in the Driver Information Center (DIC). See DIC Warnings and Messages on page 4‑76 DIC Warnings and Messages for more information. 6-32