I have a 2006 GMC Sierra that driver side won't change to cold.
I purchased a new blend door reset it and still the drivers side stays hot while
passenger side is ice cold. Than I took the actuator out and manually turned the
drivers to cold but it moves back to hot once I turn my truck off. This is the
second blend door actuator I put in an reprogrammed. Is there another
actuator that is moving that I'm not finding?