A guy that worked with my brother, had quite a commute to get to work, from Williamsport PA to wellsboro PA which is about an hour+. He had a gasser Jetta with an automatic, worst of the vw world. About half way to work his driver window fell into the door. He knew I tinkered with vw’s and so he had my brother call me.
My first question was “is he a smoker?” Yup. The first thing smokers do when they get in a car is crack the window about an inch, which is not a problem 350 days out of the year, but after hitting that down button so many times with the window iced closed the mechanism that holds the window came off the bottom of the window and traveled to the bottom of the door and set there. After driving for 30-45 minutes with the heat on the window came loose and fell. His ride was cold the rest of the way into work.
I told him how to fix it, I think I even walked him through getting the glass back into place and wedging it so he could drive home in comfort.
The point is if you drive it long enough the heat will melt the ice and the window will work once again. Provided the mechanism is still attached to the glass and hasn’t come loose.