make sure the malfunction light is not on the climate control (looks like an open book) that will mean heater blend motors,tricky!
make sure it starts ok when hot.
the heater matrix has a tendency to leak at the o rings which means wet carpets,air suspesion can cause headaches,full power braking can have issues with pumps and accumulators wearing (hard brake pedal).
make sure it has both keys,and they work otherwise you may get stranded when one packs up.
headlinings are normally sagging at that age (spray glue will not work for long!) these are just a few issues i had with mine,there are plenty of others.
that said i loved that car,just could not afford to run it.
hope this helps!