I kept vacuum wipers just for the cool factor and to say I made them work. I took the motor apart and doused it all with ATF and a penetrating oil and ran a long vacuum line from under hood to bench with wiper motor. It started working but the switching valve was still sticky. A little more fiddling and oil and she came back around and they have been working for a few years now no problems. They dont wipe much of anything but they do “operate”.
