2004 Hummer H2 Owner's Manual - Page 341

Adding Coolant If you need more coolant, add the proper DEX-COOL coolant mixture at the surge tank, but only when the engine is cool. ® Coolant Surge Tank Pressure Cap 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. 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. {CAUTION: You can be burned if you spill coolant on hot engine parts. Coolant contains ethylene glycol, and it will burn if the engine parts are hot enough. Do not spill coolant on a hot engine. When replacing the pressure cap, make sure it is hand-tight. Engine Overheating You will find a coolant temperature gage on your vehicle's instrument panel. See Engine Coolant Temperature Gage on page 3-35. In addition, you will find an ENGINE COOLANT HOT, ENGINE OVERHEATED and a REDUCED ENGINE POWER message in the DIC on the instrument panel. See DIC Warnings and Messages on page 3-56. 5-27