Typically checked by utilizing the small dipstick typically molded to the bottom of the power steering fluid cap. You should not have to add fluid. If you do, especially on a frequent basis, there is a leak in the system. Our technicians will be able to advise you where the leak is coming from and recommend the appropriate fix. Several types of power steering fluids are used by the various manufacturers, so please consult your owner's manual to ensure the proper fluid is added.