My 1997 Regal suddenly had no A/C fan, cooling fan or cruise control working. After 15 minutes or so, everything came back on. Now it happens every couple of days, lasting from 15 minutes to 24 hours. When they're not working, turning the fan knob on cause the headlights to go off completely even though the fan won't come on. I've had the battery and alternator checked and they're OK. Anyone have any suggestions?