2009 GMC Sierra 1500 Crew Cab Owner's Manual - Page 446

4. With the coolant surge tank pressure cap off, start the engine and let it run until the engine coolant temperature gage indicates approximately 195°F (90°C). By this time, the coolant level inside the coolant surge tank may be lower. If the level is lower, add more of the proper mixture to the coolant surge tank until the level reaches the FULL COLD mark. 5. Replace the pressure cap. Be sure the pressure cap is hand-tight and fully seated. 6. Verify coolant level after engine is shut off and the coolant is cold. If necessary, repeat coolant fill procedure Steps 1 through 6. 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. In addition, you will find ENGINE OVERHEATED STOP ENGINE, ENGINE OVERHEATED IDLE ENGINE, and ENGINE POWER IS REDUCED messages in the Driver Information Center (DIC) on the instrument panel. See DIC Warnings and Messages on page 3-66. You may decide not to lift the hood when this warning appears, but instead get service help right away. See Roadside Assistance Program on page 7-7. If you do decide to lift the hood, make sure the vehicle is parked on a level surface. Then check to see if the engine cooling fans are running. If the engine is overheating, both fans should be running. If they are not, do not continue to run the engine and have the vehicle serviced. Notice: Engine damage from running your engine without coolant is not covered by your warranty. See Overheated Engine Protection Operating Mode on page 5-38 for information on driving to a safe place in an emergency. Notice: If the engine catches fire while driving with no coolant, the vehicle can be badly damaged. The costly repairs would not be covered by the vehicle warranty. See Overheated Engine Protection Operating Mode on page 5-38 for information on driving to a safe place in an emergency. Engine Overheating If the vehicle has the DURAMAX® Diesel engine, see the DURAMAX® Diesel manual for more information. The vehicle has several indicators to warn of engine overheating. You will find a coolant temperature gage on the vehicle's instrument panel. See Engine Coolant Temperature Gage (US-Canada) on page 3-44. 5-36