By Ryan Quinn Air conditioning issues, which have plagued Kanawha County Schools for years, have so far closed at least three of the system's schools today -- including a second consecutive closure of a school where teachers have filed a grievance over years of continuing AC problems. Principal Paula Potter said Dunbar's Ben Franklin Career Center, where about 15 teachers filed the grievance against the public school system last week, has been closed all day today, after it closed around 10:15 a.m.