My climate control switch panel in my 86 F250 doesn't work except in one setting....When it's in AC, the air blows out of the vents, but it's not ac...the temp adj lever works, the fan selector works, but the blower selector, as far as the ac, heater, defrost, etc. doesn't switch from blowing air from the main vents. I took it out, and took the switch apart, cleaned it up, but that didn't do anything. There's no vacuum hoses or anything coming off the selector switch...anyone know where I should check next? thanks!