You know it sounds like a break in the linkage as the wiper motor will not usually let you freely move the wiper arms yourself. Generally there is an arm attached to the motor which in going around and around makes a side to side action in the wiper linkage. Without any more info I would suspect a failure in the ball joint connection between the wiper motor arm and the linkage. On a car that old most likely you should look around for a replacement used linkage on eBay or Craigslist. Once obtained, get yourself a repair manual or search on youtube for a video on how to remove and replace the linkage. there are many folks selling repair manuals on CD for about 10 bucks on eBay.
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