sometimes the automatic headlights would not shut off. sometimes the AC blower fan would be on with the key off & out of car. sometimes the AC would stop blowing cold, but if car was stopped & restarted it would work ok again. Battery was replaced. O.E. ignition switch replaced. fan controller replaced(RECALL). G.M. replacement front E.C.U.part #MR515500. G.M. replacement block chassis junction box part #MR969424.