91 all trac auto hvac issues

utahalltrac1

New member
Ok so I just bought this car, and I knew the auto ac had problems but I thought it was just the blower motor control module.. not the case. I tested the control head, off vehicle, using some test leads and a 12 volt battery and the only thing that doesn't seem to work is the fresh air/recirculation button. With everything plugged in the only thing that works is the mode door selection buttons ( I can hear the door change positions). Nothing from the automatic button, fan speed selection buttons(they light up when pressed but that's it), ac button, recirc/fresh air button, or the temperature dial ( can't hear the blend door moving. Anyone delta with these hvac systems, or have any ideas?
 

utahalltrac1

New member
Found the problem, auto ac amplifier located next to accelerator pedal was rusted and corroded. Replaced it today and all is well.
 
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