2003 Chevrolet Tahoe Owner's Manual - Page 383

Coolant Surge Tank Pressure Cap See Engine Comparfment Overview on page5-14 for Engine Overheating You will find a coolant temperature gage on your vehicle's instrument panel. See Engine Coolant Temperature Gage on page 3-44. In addition, you will find a LOW COOLANT LEVEL, ENGINE OVERHEATED and a REDUCED ENGINE POWER message in the DIC on the instrument panel. See Driver information Center (DIC) on page 3-52. Overheated Engine Protection Operating Mode (V8 Engines Only) The coolant surge tank pressure cap must be fully installed on the coolant surge tank. Notice: Your pressure cap is a pressure-type cap loss and must be tightly installed to prevent coolant and possible engine damage from overheating. See "Capacities and Specifications" for more information. If an overheated engine condition exists and the REDUCED ENGINE POWER message is displayed, an overheat protection mode which alternates firing groups of cylinders helps prevent engine damage. In this mode, you will notice a loss in power and engine performance. This operating mode allows your vehicle to be driven to a safe place in an emergency. 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 operatingmode, to avoid engine damage, allow the engine to cool before attempting any repair. The engine oil will be severely degraded. Repairthe cause o coolant loss, change the oil and reset the f life system.See "Engine Oil" in the Index. 5-30