1998 Chevrolet Venture Owner's Manual - Page 311

If Steam Is Coming From Your Engine Steam from an overheated engine can burnyou badly, even if you just open the hood. Stay away from theengine if you see or hear steamcoming off and get everyone away from it. Just turn it from thevehicle until itcools down. Wait until there is no signof steam or coolant beforeyou 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 of the vehicle until the it overheats, and get out engine is cool. I NOTICE: If your engine catches fire because you keep driving with no coolarmt, 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. 5-14