2003 Buick Regal Owner's Manual - Page 232

Radiator Pressure Cap Notice: Your radiator cap 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 with the up 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 5-12for more information on location. 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 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. Engine Overheating You will find a coolant temperature gage and a hot engine warning light on your instrument panel. See Engine Coolant Temperature Gage on page 3-35 and Engine Coolant Temperature Warning Light on page 3-35. Notice: After driving in the overheated engine protection operatingmode, to avoid engine damage, allow the engine to cool before attempting any repa The engine oil will be severely degraded. Repair the cause of coolant loss, change the oil and reset oil the life system.See "Engine Oil" in the Index. 5-27