Thanks to everyone who provided suggestions yesterday. I removed the motor and took it apart.
I greased up the chamber that the paddle moves in.
I opened up the passage that I had plugged yesterday. When I reinstalled the motor nothing much happened. The air is being sucked in through the outlet quite strongly, there is plenty of suction being provided from the hose that goes to the engine manifold. The wipers aren't moving.
What do you suppose is wrong???
Thanks once again in advance.
John Flowers