HVAC Controller Always On

Michael Palatas mpalat at gmail.com
Tue Oct 10 15:09:41 EDT 2006

Hi guys,

The last 5 times I have driven the car, the HVAC controller starts in the
Auto mode with 65 degrees setting.  Pressing any other button will not
change its operation, including the OFF button.  Holding the off button down
will shut it down, but as soon as it is released, it starts back up in
auto.  I tried to get it to enter the fault diagnosis, but the usual button
push sequence for that has no effect either.

Is that behavior the definitive fail symptom for that A/C suppressing diode
that I have read a few posts on since I have been reading the list?

Mike in Burbank
'91 20V 200TQ, 112K

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