Sounds like your Wiper Motor may be going bad or you have a loose connection. I had that problem with my '91 APV. If I manually pulled on them they would start working but would eventually lock up again. They would also stop working when it was raining. It turned out to be a bad electrical connection in the wiper motor. If you wiggle the wires going into the wiper motor ( WATCH OUT FOR THE MOVING LINKAGE! ) you may find that that is the problem. Replace the motor and it should work.
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