after you got the motor out and torn apart,it could be the triangle metal lookin thing that goes into a white plastic piece that goes to the motor..the metal thing spins and its suppost to spin the plastic piece,if it doesnt put some little pieces (3) of metal between the metal and plastic piece so they both turn at the same time...i just did this to my buddies 89 and fix it..cuz the window wouldnt roll up or down, but you could here the motor working..hope this helps