2003 Chevrolet Blazer Owner's Manual - Page 290

If Steam Is Coming From Your Engine Wait until there is no sign of steam or coolant before you open the hood. If you keep driving when your engine is overheated, the liquids in it can catch fire. You or others could be badly burned. Stop your engine if it overheats, and get out of the vehicle until the engine is cool. 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. If No Steam Is Coming From Your Engine I Steam from an overheated engine can burn you badly,even if you just open the hood. Stay away from the engine if you or hear steam see coming fromit. Just turnit off and get everyone it away from the vehicle untilcools down. If you get an engine overheat warning but see or hear no steam, the problem may not be too serious. Sometimes the engine can get a little too hot when you: 0 Climb a long hill on a hot day. 0 0 CAUTIQN: (Continued) Stop after high-speed driving. Idle for long periods in traffic. Tow a trailer. See "Driving on Grades" under Towing a Trailer on page 4-5 1. 5-27