It's getting hot in here, so put down the windows

I have an '83 300D and none of the four power windows will roll down. I bought this car with this problem back in April, and now since it's getting warmer the car has become an oven. Fortunately, the sunroof still works (sort of). I was directed to the "ice cube relay" behind the instrument panel in a related thread, but was unable to get any more information. Any ideas? I am on a tight budget and so must do as much on my own as I can.
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