How To Check Power Steering Fluid
With the engine off, clean the power steering cap before removal. The level indicator is on the underside of the cap. Some will have a COLD and HOT full mark.
Adjust level to the temperature of the fluid. If low, have the system inspected for leaks. Low fluid can cause power steering pump noise, and possible failure. Some typical areas of leaks are the lines, hoses, steering rack seals.