REAR WINDOW

I HAD THIS SAME PROBLEM ON MY 91. CHECK THE REAR WINDOW WIPER AND MAKE SURE IT IS ALL THE WAY SEATED AGAINST THE STOP. THERE IS A SWITCH IT HAS TO MATE OTHERWISE THE WINDOW WONT WORK. THIS IS A SAFETY FEATURE SO YOU DONT ACCIDENTALLY PUT THE WINDOW UP AND BREAK OFF YOUR WIPER. I HOPE THIS WORKS OUT FOR YOU.