2011 Chevrolet Impala Owner's Manual - Page 279

Vehicle Care WARNING (Continued) If you keep driving when the vehicles 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. See Overheated Engine Protection Operating Mode on page 10‑24 for information on driving to a safe place in an emergency. 10-23 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: ... If the overheat warning is displayed with no sign of steam: 1. Turn the air off. 2. Turn the heater on to the highest temperature and to the highest fan speed. Open the windows as necessary. 3. In heavy traffic, let the engine idle in N (Neutral) while stopped. If it is safe to do so, pull off the road, shift to P (Park) or N (Neutral) and let the engine idle. Climbs a long hill on a hot day Stops after high-speed driving Idles for long periods in traffic Tows a trailer