2007 Chevrolet Impala Owner's Manual - Page 329
2007 Chevrolet Impala Manual
Page 329 highlights
Overheated Engine Protection Operating Mode This emergency operating mode allows your vehicle to be driven to a safe place in an emergency situation. If an overheated engine condition exists, an overheat protection mode which alternates firing groups of cylinders helps prevent engine damage. In this mode, you will notice a significant loss in power and engine performance. The coolant temperature gage will indicate an overheat condition exists. Driving extended miles (km) and/or towing a trailer in the overheat protection mode should be avoided. Notice: After driving in the overheated engine protection operating mode, to avoid engine damage, allow the engine to cool before attempting any repair. The engine oil will be severely degraded. Repair the cause of coolant loss, change the oil and reset the oil life system. See Engine Oil on page 312. Cooling System When you decide it is safe to lift the hood, here is what you will see: 3.5L V6 Engine shown, 3.9L Engine similar A. Coolant Recovery Tank B. Pressure Cap C. Electric Engine Cooling Fans 329