I recently bought a 97 legacy L, 2.2, auto , 270K. Runs well but had a noticeable quirk
; if you turned the key on but didn't start it the fans would cycle on and off, on and off. Somewhere on this forum I read that that was a symptom of the diagnostics being connected. They were ( though mine were green, not black.) when disconnected, the fans stopped cycling and I haven't noticed any other ill affects