2011 Chevrolet Express 1500 Cargo Owner's Manual - Page 297

Vehicle Care What to Use To determine what kind of fluid to use, see Recommended Fluids and Lubricants on page 11‑8. Always use the proper fluid. Failure to use the proper fluid can cause leaks and damage hoses and seals. 10-27 Adding Washer Fluid . 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 windshield washer system and paint. Washer Fluid What to Use When the vehicle needs windshield washer fluid, be sure to read the manufacturer's instructions before use. If operating the 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 10‑6 for reservoir location. Notice . . When using concentrated washer fluid, follow the manufacturer's instructions for adding water. .