2004 Buick Regal Owner's Manual - Page 237

Radiator Pressure Cap Notice: The radiator cap on your vehicle is a pressure-type cap and must be tightly installed to prevent coolant loss and possible engine damage from overheating. Be sure the arrows on the cap line up with the overflow tube on the radiator filler neck. The radiator pressure cap is located near the front of the engine compartment on the passenger's side of the vehicle. See Engine Compartment Overview on page 5-12 for more information on location. Overheated Engine Protection Operating Mode The emergency operating mode allows the vehicle to be driven to a safe place in an emergency situation. If an overheated engine condition exists, this 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 will move to the red area and the engine coolant temperature warning light will come on, indicating that an overheated engine condition exists. Driving extended miles (km) and/or towing a trailer in the overheated engine protection operating 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 5-16. Engine Overheating The coolant temperature gage and the hot engine warning light on the instrument panel can indicate an overheated engine condition. See Engine Coolant Temperature Gage on page 3-34 and Engine Coolant Temperature Warning Light on page 3-34. 5-29