1998 Buick Century Owner's Manual - Page 284

Power Steering Fluid How To Check Power Steering Fluid When the engine compartment is cool, 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. When to Check Power Steering Fluid It is not necessary to regularly check power steering fluid unless you suspect there is a leakin the system or you hear an unusual noise. A fluid loss in this system could indicate a problem. Have the system inspected and repaired. When the engine compartment is hot, the level should be at the HOT mark. If the fluid is at the ADD mark, you should add fluid. 6-24