[paul2748]

In many cases, an old vacuum wiper can be fixed with a little brake fluid (some use ATF) . What happens a lot of the time is that the "paddle" inside dries out and the brake fluid or ATF makes the paddle swell again to provide the seal needed. If still on the car, this can be done by pouring a little brake fluid in a bottle or can, inserting the vacuum hose going to the motor into the fluid and manually working the wiper blade back and forth about 6 -8 times. This should suck up the fluid into the wiper motor. Let sit overnight and then test it. Remember to put a rag under the motor (inside) to catch anything that may leak. Car may smoke some at first start up, but it will clear up. Do it again if needed.