Windshield wipers

Hi Bob & Ken,

I have a 94 Mercury Capri with 140,000mi, and my
problem is, the passenger wiper works fine but
the driver side is not working at all. First, it was
slow while the right one still worked its normal speed.
One day while driving and using the wipers, the left
wiper just went all the way to the left so I had to
stop the car and put it back. It can't be the motor
if the right side is still working, right? I really need
help on this one! Thanks, Shelia