2007 Chevrolet Colorado Owner's Manual - Page 348

Add coolant mixture at the recovery tank, but be careful not to spill it. Engine Overheating A coolant temperature gage is on the instrument panel. See Engine Coolant Temperature Gage on page 189. The air conditioning might stop working if the engine is too hot. This is normal and helps cool the engine. {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. Occasionally check the coolant level in the radiator. For information on how to add coolant to the radiator, see Cooling System on page 350. 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. Just 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. CAUTION: (Continued) Radiator 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. See Engine Compartment Overview on page 332 for more information on location. 348