2007 Pontiac Grand Prix Owner's Manual - Page 366

Overheated Engine Protection Operating Mode The overheated engine protection operating mode allows the vehicle to be driven to a safe place in an emergency situation. If an overheated engine condition exists, this protection mode alternates firing groups of cylinders to help prevent engine damage. In this mode, there will be a significant loss in power and engine performance. The engine coolant temperature gage indicator will move to the shaded area, and the engine coolant temperature warning light will come on, showing that an overheated engine condition exists. Driving extended miles (km) and/or towing a trailer in the overheated engine 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 350. Cooling System When you decide it is safe to lift the hood, here is what you will see: 3800 V6 Supercharged Engine shown, 3800 V6 Engine similar A. Coolant Recovery Tank B. Electric Engine Cooling Fan(s) C. Pressure Cap 366