2014 Chevrolet Sonic Owner Manual - Page 270

10-20 Vehicle Care { Caution 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. { Caution Running the engine without coolant may cause damage or a fire. Vehicle damage would not be covered by the vehicle warranty. Warning (Continued) If you keep driving when the engine is overheated, the liquids in it can catch fire. You or others could be badly burned. Stop the engine if it overheats, and get out of the vehicle until the engine is cool. Engine Overheating The vehicle has an indicator to warn of the engine overheating. 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 fan is running. If the engine is overheating, the fan should be running. If it is not, do not continue to run the engine. Have the vehicle serviced. If Steam Is Coming from the Engine Compartment { Warning Steam from an overheated engine can burn you badly, even if you just open the hood. Stay away from the engine if you see or hear steam coming from it. Just turn it off and get everyone away from the vehicle until it cools down. Wait until there is no sign of steam or coolant before you open the hood. (Continued) If No Steam Is Coming from the Engine Compartment If an engine overheat warning is displayed but no steam can be seen or heard, the problem may not be too serious. Sometimes the engine can get a little too hot when the vehicle: ... Climbs a long hill on a hot day. Stops after high-speed driving. Idles for long periods in traffic. If the overheat warning is displayed with no sign of steam: 1. Turn the air conditioning off.