93 taurus power steering?

my friend has a 93 tuarus with a 3.0l v6(i think thats what the v6 is). and he is having a problem with his power steering. it was fine untill one night he was driving and it was really hard to turn the tires to the left but when he turns the tires to the right it is really easy. should i say its like he has now power steering when he turns to the left and has power steering when he turns to the right. what do you think could possibly be wrong?

Sounds like a steering rack hydraulic problem, but I would rule out mechanical faults first (tie-rods, ball joints, etc.), then try flushing the power steering fluid completely.