No, it doesn't
Mercon Automatic Transmission Fluid, ATF.
what is variable gear ratio steering steering system?
Most steering boxes are now variable ratio.
There is no power steering filter
you need to give more information. engine size? is it SHO or not? is it Flex Fuel? is the power steering rack variable or non variable? you need to give more information if you want the right part.
8.0 quarts are needed for a 1990 ford taurus.
All Ford Taurus power steering systems take MERCON V Transmission Fluid.
According to the 2002 Ford Taurus Owner Guide : ( Motorcraft MERCON automatic transmission fluid is used as the power steering fluid )
the Pump does not control this, it is internal to the steering gear system, usually a "Steering Rack" Telling if or not will be a matter of getting the Steering Rack # and checking to see if it capable of variable boost.
Try checking the power steering fluid. My taurus did the same thing until i filled the power steering fluid.
According to the 1998 Ford Taurus Owner Guide : ( Motorcraft MERCON automatic transmission fluid is used as the power steering fluid )
NV7 is with Variable Effort Steering. N40 is with Non-Variable Effort Steering. Check the "Service Parts Identification" sticker for your car. Variable Effort Steering will have an electronic control valve on one side of the power steering pump with an electrical connector. The Variable Effort Steering "EVO" valve adjust the amount of power steering assist. It is intended to make the steering stiffer at higher speeds. This helps prevent the vehicle from wandering at highway speeds.