2003 Chevrolet Impala Owner's Manual - Page 283

If Steam Is Coming From Your Engine dov Wait until there is no sign of steam or coolant before you open the hood. If you keep driving when your engine isoverheated, the liquids in it can catch fire. You or others could be badly burned. Stop your engine it if overheats, and get out of the vehicle until the engine is cool. See "Overheated Engine Protection Operating Mode" in the Index for information on driving to a safe place in an emergency. Notice: If your engine catches fire because you keep driving with no coolant, your vehicle can be badly damaged. The costly repairs would not be covered by your warranty. See "Overheated Engine Protection Operating Mode" in the Index for information on driving to safe place inan a emergency. steam from an overheated engine can burn you badly, even if you just open the hood. Stay away from the engine if yousee or hear steam coming fromit. Just turn it off and get everyone away from the vehicleuntil it cools CAUTION: (Continued) 5-30