'88-92 90 Climate Control

[Steve Ensch]

Has anyone adjusted the potentiometer on their 88-92 90?  I have checked the
vacuum lines and the flaps will close when I apply manual vacuum.  I have
checked the vacuum reservoir (egg crate) it meets the spec holds 8.8hg/2
minutes.  What controls the vacuum supply to the 6 colored lines into the
cabin?  Where is the vacuum line from the engine that goes to the 6 plug
vacuum connector in the cabin?  The flap position for the center vacuum
valve is within spec 0.75" or 11mm, the next check is the 08 fault check
while adjusting the potentiometer.  I have seen potentiometers fail on many
older cars, should I just replace it?  Or is this the ACC programmer?

Thanks,
Steve