2014 Chevrolet Impala Owner Manual - Page 296

10-22 Vehicle Care 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. 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 DEX-COOL coolant mixture to the coolant surge tank until the level reaches the indicated level mark. 5. Replace the pressure cap tightly. Check the level in the coolant surge tank when the cooling system has cooled down. If the coolant is not at the proper level, repeat Steps 1- 3 and reinstall the pressure cap. If the coolant still is not at the proper level when the system cools down again, see your dealer. will allow any pressure still left to be vented out the discharge hose. 2. Keep turning the pressure cap slowly and remove it. Engine Overheating There is a coolant temperature gauge on the instrument cluster that indicates an overheated engine condition. See Engine Coolant Temperature Gauge on page 5-14. If the decision is made not to lift the hood when this warning appears, get service help right away. See Roadside Assistance Program on page 13-5. If the decision is made 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 fans should be running. If not, do not continue to run the engine and have the vehicle serviced. 3. Fill the coolant surge tank with the proper DEX-COOL coolant mixture to the indicated level mark.