---- snipped ----
Electric locks use solenoids (linear motors) rather than rotary motors.
---- end snipped ----

My '87 GL has rotary motors...

I watched them spin as I overhauled them, after connecting power to the
motors alone. They have a shaft, a worm gear, and spin two plastic gears to
operate the locking mechanism.

Perhaps the Eurovan has a different unit for pushing the locks up and
down... but I can only speak for Vanagons.

RSF

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Robert S. Fish
Salzburg, Austria
1987 Wolfsburg Vanagon 2.1 GL Weekender
1987 Golf Cabriolet
1991 Golf