1994 GMC Safari Owner's Manual - Page 249

I NOTICE: When adding power steering fluid or making a complete fluid change, always use properfluid. Failure to use the proper the fluid can cause leaksand damage hoses and seals. Windshield Washer Fluid To Add, Open the cap labeled WASHER FLUID ONLY. Add washer fluid until the tank is full. NOTICE: When usingconcentrated washer fluid, followthe 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 the washer system. Also,water of doesn't clean as well as washer fluid. Fill your washer fluid tank only 3/4 full whenit's very cold. This allows for expansion, which could damage the tank if it is completely full. ~ ~ I Don't use radiator antifreeze in your windshield washer.It can damage your washer system and paint. 6-31