86 Dodge B-250

control panel for ac and heating is electrical and i cant trace the wiring the control for the differant levels,bi level,ac,heat i cant locate the control for changing in the distribution box does anyone know where this is or what could be wrong

thanks

if your ac/heater control is like my 86, its probably in the vacuum block that has multiple small hoses that are coming loose from it. I just pulled them out and with short pieces of hose re-connected them. hope that helps.