Power Steering Function:
As the steering wheel in your car is turned, the power steering pump forces oil through a pressure line to a control valve. The valve mechanically senses the need for steering in one direction or the other and directs the oil to the power cylinder to make steering easier.
The oil reservoir on the power steering pump usually contains a dipstick for checking the fluid level. It is mounted in the forward section on the engine. With the engine off, clean the outer surfaces of the reservoir before opening the cap or removing the dipstick, so you will not introduce dirt into the system. If the fluid is low, add power steering fluid. Do not overfill. The power steering system must be filled to the proper level at all times.