2010 Cadillac STS Owner's Manual - Page 392

Windshield Washer Fluid What to Use When you need windshield washer fluid, be sure to read the manufacturer's instructions before use. If you will be operating your vehicle in an area where the temperature may fall below freezing, use a fluid that has sufficient protection against freezing. Open the cap with the washer symbol on it. Add washer fluid until the tank is full. See Engine Compartment Overview on page 6‑13 for reservoir location. Notice: . Adding Washer Fluid The CHECK WASHER FLUID message will appear on the Driver Information Center (DIC) when the fluid level is low. See DIC Warnings and Messages on page 4‑76 for more information. When using concentrated washer fluid, follow the manufacturer's instructions for adding water. Do not mix water with ready-to-use washer fluid. Water can cause the solution to freeze and damage the washer fluid tank and other parts of the washer system. Also, water does not clean as well as washer fluid. Fill the washer fluid tank only three-quarters full when it is very cold. This allows for fluid expansion if freezing occurs, which could damage the tank if it is completely full. Do not use engine coolant (antifreeze) in the windshield washer. It can damage the vehicle's windshield washer system and paint. . . . 6-36