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BTW I have an 86 and it has the same problem, as well as issues with the wipper arms. Does anyone know where we can find parts for these old air wiper systems?

Terry,  not sure where you are located but if your on the east coast you could reach out to Luke at US Coach in Vineland, NJ (856) 794-3104. He is a wealth of knowledge on old bus parts, you’re going to have to find out what kind of air wiper parts you have though, he mainly deals with over the road type buses, am sure he is not going to know what your Newell needs.