if the fuse keeps blowing you have a short.
find the short first or you may loose your beloved 944 to a fire.
I had a 1985 regal with the same problem and it was a wire near the seat
rail. mine would short every time the seat was moved

hope this helps
Brian

I am assuming you have the 4 way seats. Two buttons, up and down arrows on
each button. The motors on the seats do go belly up from time to time, you
can disconnect them separately, not only seat to seat, but between the
motors as well. I would completely disconnect both seats to start (and if
you don't have a meter) put a fuse in and see if it holds with the seats
disconnected. If yes, reconnect the passengers seat. Does the fuse blow? if
yes, dx one of the motors. Try again.
The best method is to look for a short. The seats are wired pretty
simply...from the fuse to  a Y, one of which goes to the drivers seat and
the other to the passengers seat. Under each seat there is a black
connector. The wires are then jumped in the connector to split off the two
motors. a meter reading from the plug to the motors should give away your
bad motor.