My sister had an AMC Gremlin while earning her second B.S. at University of Washington around 1980. She drove it back and forth to Pullman across the Cascade mountains a number of times during that period, often in the winter when it was raining west of the mountains and snowing east of them. That thing still had vacuum wipers, and I think it was the last US production car (1970-78) to do so.
Anyway, those of us who have reached a certain age remember that vacuum wipers SUCKED. Every time you accelerated, vacuum dropped and the wipers tried to stall. The Gremlin wipers were especially bad about stalling out. They were designed to meet in the center and move up and out on both sides.
My dad put three different wiper motors on that Gremlin, and he never could get the wipers to work decently. He finally tied a string to the driver side wiper and ran it into the driving compartment, so my sister could pull on it and bring the wipers up when they stalled at the bottom of the windshield, as they often did. I think she drove that car for three years before getting into something better.