2010 Buick LaCrosse Owner's Manual - Page 301

Vehicle Care 4. With the coolant surge tank cap off, start the engine and let it run until the upper radiator hose starts getting hot. Watch out for the engine cooling fan(s). 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 mark pointed to on the front of the coolant surge tank. 5. Replace the cap. Be sure the cap is hand-tight and full seated. 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 coolant is needed, add the proper DEX-COOL® coolant mixture at the coolant recovery tank. 9-21 Engine Overheating The vehicle has several indicators to warn of engine overheating. There is a coolant temperature gauge and a warning light on the instrument panel cluster that indicate an overheated engine condition. See Engine Coolant Temperature Gauge on page 4‑14 for more information. You may decide not to lift the hood when this warning appears, but instead get service help right away. See Roadside Assistance Program on page 12‑6. 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, the fan(s) should be running. If they are not, do not continue to run the engine and have the vehicle serviced. Notice: Engine damage from running the engine without coolant is not covered by the warranty.