2010 Chevrolet Silverado 1500 Regular Cab Owner's Manual - Page 478

Turn the pressure cap slowly counterclockwise about one full turn. If you hear a hiss, wait for that to stop. A hiss means there is still some pressure left. 2. Keep turning the pressure cap slowly, and remove it. 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. 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. 3. Fill the coolant surge tank with the proper mixture to the FULL COLD mark. 4. With the coolant surge tank pressure cap off, start the engine and let it run until the engine coolant temperature gauge indicates approximately 195°F (90°C). 6-34 You will find a coolant temperature gauge on the vehicle's instrument panel. See Engine Coolant Temperature Gauge on page 4‑40. 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 4‑63.