2004 GMC Sierra 1500 Pickup Owner's Manual - Page 447

The windshield washer fluid reservoir is located in the engine compartment toward the front of the vehicle on the driver's side. Notice: • 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 your washer fluid tank and other parts of the washer system. Also, water does not clean as well as washer fluid. Open the cap with the washer symbol on it. Add washer fluid until the tank is full. • Fill your washer fluid tank only three-quarters full when it is very cold. This allows for expansion if freezing occurs, which could damage the tank if it is completely full. • Do not use engine coolant (antifreeze) in your windshield washer. It can damage your washer system and paint. 5-47