2003 Pontiac Bonneville Owner's Manual - Page 300

Adding Washer Fluid The washer fluid warning light will come on when the ignition switch is on and the fluid container is less than one-third full. On vehicles with the optional Driver Information Center (DIC), a WASHER FLUID LOW message will be displayed and a chime will sound letting you know to add windshield washer fluid to your vehicle. Open the cap with the washer symbol on it. Add washer fluid until the tank is full. Notice: e When using concentrated washer fluid, follow the manufacturer's instructions for adding water. Don't mix water with ready-to-use washer fluid. Water can cause the solution to freeze and damage your washer fluid tank and other parts of the washer system.Also, water doesn't clean as well as washer fluid. Fill your washer fluid tank only three-quarters full when it's very cold. This allows for expansion if freezing occurs, which could damage the tank ifit is completely full. Don't use engine coolant (antifreeze)in your windshield washer. It can damage your washer system and paint. e e 0 5-4 1