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this is normally caused by a bad wiper motor or binding of the wiper gears and linkage arms.
check to see if the linkage arms are tight and not loose. also try and lube up the pivot points.
another thing to check is to make sure you have 12 volts to the heater.
check your ground conections under the dash first. and if they look ok take them apart and clean them anyway, and if the problem is still not fixed look for what all of these systems have in common. i would suspect the grounds though its common on vw problems.
Sounds like a linkage (wiper transmission) problem. But, put an external ground wire to the wiper motor first and see if they work then. Also many wipers have a fastening nut on the wiper arm where it attaches to the stub that goes through the body. These may have loosened and gone out of adjustment. If so, loosen them and re-position arms, then tighten them down.
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