2008 Ford Escape problem with the power steering

When the steering wheel wants to return to a position other than center, this is known as memory steer. Memory steering occurs when a steering component or bushing binds and prevents the steering gear from smoothly rotating back to the center. That is why it is important that all steering component be tightened in their normal resting position.
If the problem did exist after you changed the steering column, recheck the installation of that part.
If the problem existed before you change the steering column, the control valve in the steering gear fails and bypasses fluid into one side or the other of the boost cylinder piston causing the steering to want to turn itself to one side.

Hope this help.