2008 GMC Sierra 1500 Pickup Owner's Manual - Page 338

Coolant Surge Tank Pressure Cap Notice: If the pressure cap is not tightly installed, coolant loss and possible engine damage may occur. Be sure the cap is properly and tightly secured. The coolant surge tank pressure cap must be fully installed on the coolant surge tank. See Engine Compartment Overview on page 5-12 for more information on location. If Steam Is Coming From Your Engine {CAUTION: Steam from an overheated engine can burn you badly, even if you just open the hood. Stay away from the engine if you see or hear steam coming from it. Turn it off and get everyone away from the vehicle until it cools down. Wait until there is no sign of steam or coolant before you open the hood. 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 your engine if it overheats, and get out of the vehicle until the engine is cool. See Overheated Engine Protection Operating Mode on page 5-28 for information on driving to a safe place in an emergency. Engine Overheating There is a coolant temperature gage on your vehicle's instrument panel. See Engine Coolant Temperature Gage on page 3-43. In addition, ENGINE OVERHEATED STOP ENGINE, ENGINE OVERHEATED IDLE ENGINE, and a ENGINE POWER IS REDUCED message comes on in the Driver Information Center (DIC) on the instrument panel. See DIC Warnings and Messages on page 3-59. 5-26