over heating
A 97 car (depending on the mileage - i'm guessing its got around 50,000 on the clock) should not have a head gasket go. Obviously if it's done 150,000 fair enough.
If it's over heating the first thing to chnage would be the electric fan switch (screws into the rad), as these tend to go on almost all cars. It's cheap and if it isn't the problem you haven't laid out loads on a new rad or something silly.
My thoughts, but I haven't had such a problem before.