Oldsmobile 2004 Alero - Manual (Page 255)

6. Replace the pressure cap. Be sure the pressure
cap is hand-tight and fully seated.
See your dealer, if necessary.
Power Steering Fluid
When to Check Power Steering Fluid
It is not necessary to regularly check power steering fluid
unless you suspect there is a leak in the system or
you hear an unusual noise. A fluid loss in this system
could indicate a problem. Have the system inspected
and repaired. See Engine Compartment Overview
on page 5-12 for reservoir location.
5-35