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91 all trac auto hvac issues

Sat Jan 16, 2016 2:58 am

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?
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Re: 91 all trac auto hvac issues

Mon Feb 08, 2016 11:01 pm

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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