Stuck in recirculate

My '97 Voyager is suddenly stuck in recirculate. I have run the system calibration test with no change in status. The rest of the airflow is normal, switching from floor through defrost normally. The recirc button being on or off makes no difference.
Does anyone have an idea where I should start to look?
Thanks in advance.

My '97 Voyager is suddenly stuck in recirculate. I have run the system calibration test with no change in status. The rest of the airflow is normal, switching from floor through defrost normally. The recirc button being on or off makes no difference.
Does anyone have an idea where I should start to look?
Thanks in advance.
If the button operates normally when you push it then you are probably going to have to replace that panel that controls the hvac , you might get one out of junk yard.

Thanks,
That was the first thing that came to mind. I will try to get one next weekend. We have a Pick a Part about an hour from here. The local yards are more expensive.