2003 GMC Yukon Owner's Manual - Page 397

How to Check Power Steering Fluid Turn the key off, let the engine compartment cool down, wipe the cap and the top of the reservoir clean, then unscrew the cap and wipe the dipstick with a clean rag. Replace the cap and completely tighten it. Then remove the cap again and look at the fluid level on the dipstick. The level should be at the FULL COLD mark. If necessary, add only enough fluid to bring the level up to the mark. Adding Washer Fluid Open the cap with the washer symbol on it. Add washer fluid until the tank is full. What to Use To determine what kind of fluid to use, see Part D: Recommended Fluids and Lubricants on page 6-17. Always use the proper fluid. Failure to use the proper fluid can cause leaks and damage hoses and seals. Notice: • 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. 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. See Engine Compartment Overview on page 5-12 for reservoir location. • 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 if it is completely full. • Don't use engine coolant (antifreeze) in your windshield washer. It can damage your washer system and paint. 5-39