What should I check when buying a SVX?

I am considering buying a SVX I have seen locally, and I was wondering if some of the experts can help me out.

The windsheild says it's a 91, but from what I understand 92 was the first year, so it must be a mistake. The car is silver with a black top, has 60,000 miles, seems fairly clean, and they are asking $4000. I go back tomarrow to test drive it and ask more questions, no one was at the lot today when I went there.

What should I check, and what questions should I ask? These cars are totally alien to me. I really love the idea of a flat six and AWD, but I don't want a money pit. I need it to be able to take 15k+ miles per year and stay fairly reliable. And since I live in Florida, reliable A/C is a must.

Any help would be tremendously appreciated.