Chevrolet Repair: Heater controls 1990 chevy 1500, 1990 chevy 1500, heating and air conditioning


Question
My heating and air conditioning controlls digital type have quit working I have checked all the fuses and looked for loose connections now what where do I look for my problem its a wiring nithtmare behind the control head and could use some direction.

Answer
Behind that control head there is just one connector that plugs on the board for the heater-A/C controls. I have seen the problem corrected by unpluging it, and reconnecting it, but eventually the board will probably need replaced. But the board slides out quite easily, when the cluster is removed.
Van