sounds like something on your window regultaors has snapped, this is what happened on my AE82, remove your door trim and have a look inside your door and you will be able to see what is happening!
Then take a trip out to the wrecker and grab a window regulator from another KE70 and replace yours then enjoy the nice cold winter air in your face!
Good luck!
Cheers.
-Whitchy-
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