have had a 98 GXL Impreza in the family for a few years, was my sons and now my daughter has inherited it. Recently the windscreen wiper action has decided to intermittently move past the normal bottom resting stop and disappears off the windscreen until it smashes into the plastic. This however does not happen all the time, at first I thought the motor mechanism had just failed (maybe it has) but then from one day to the next it works fine, then decides to not stop and at the bottom of the arc.
I could understand it if it did it all the time but how a mechanical action stops n starts has got me confused (not hard to do mind you).
Hasn't been in any accidents or had any need for any of the mechanism or blade arms to be removed.