I also have the drivers side speakers problem. It happened after i replaced the headunit because the wiring harnesses are of poor quality. I find that if i turn the volume up loud for a second all the speakers begin to work, then i can turn the volume back down. I replaced the harness, which helped significantly. The brand circuit city sells is crap, so try to stay away from that.
randomds
(currently selling my 2000 SVT Contour after a slew of problems convinced me to stay away from Ford.)
