2003 GMC Sierra 1500 Pickup Owner's Manual - Page 412

If Steam Is Coming From Your Engine everyone away trom tne VE cle it cot.down. 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. See "Overheated Engine Protection Operating Mode" in the index for information on driving to a safe place inan emergency. Nofice: 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 a safe place an in emergency. Steam from an overheated engine can bLl 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 CAUTION: (Continued) I 5-37