I have a 2004 Mountaineer, on the driver's side there is a noise, a scrubing.

thhat could be one of several things from incorrect size of tires a brake problem your cv/u joints to your steering gear to your driveline or axle youll have to inspect all of those and usually a visual inspection will tell you look underneath check for excessive wear, when your vehicle is parked level wth the tires straight do your wheels sit perpendicular to ground not leaning is their excessive dust on your brakes are the zircs greased are the joints looking the same around the whole car is your axle straight and the driveline not hanging wierd is their stuff coming out of anything like your steering gear transmission or somewhere you cant quite see does it look like somethin crapped on your differential when you havent seen a giant squirrel under your vehicle. do your springs look like they got spring in em or like they might have lost their spring... a visual inspection can tell you a bunch. start their