So I am considering looking at another 87 wagon. It has 315k (eek?) but sounds like it has been maintained very well. And apart from that, it has everything that I am looking for. Bad idea?

I asked the guy how the a/c is working, and he said

"A/c works Whenever the a/c axillary fan is hooked up and the car is running it runs so i unhook the fan when not using a/c"

Off the bat, this doesn't sound like a big deal, but I am confused. Any ideas?
Sounds to me like some screwy electrical problem, not related directly to the actual ability of the a/c to do its job.