hello everyone, i have a 2004 buick century..the windshield wipers just stopped in the 12 o-clock position,there was some snow and ice on the window at the time..i was able to move the wipers down by hand but now they only move about 3" when turned on..i suspect either the motor or transmission went bad,how do i determine the problem? could the motor be bad even though the wipers still move back and forth about 3 inches? what would the symptoms be of a bad transmission? thanks