1995 GMC Sonoma Owner's Manual - Page 243

How To Check Power SteeringFluid When the engine compartment is cool, 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. Add enough fluid to bring the level up to the mark. A fluid loss in this system could indicate a problem. Have the system inspected and repaired. What toAdd Refer to the Maintenance Schedule to determine what kind of fluid to use. See "Recommended Fluids and Lubricants" in the Index. NOTICE: When adding power steering fIuid or making a complete fluid change, always use the proper fluid. Failure to use the proper fluid can cause leaks and damage hoses and seals. 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. To Add Open the cap labeled WASHER FLUID ONLY. Add washer fluid until the tank is full. 6-25