Force recirculation to stay on?

The manual max AC control is independent of auto climate controls (does manual max AC also time out?). The auto climate/temp computer can invoke recirc when it thinks its needed to maintain cabin comfort or disable recirc when it thinks fresh air is needed. When set to manual control, it may work differently. Just saying there are potentially a number of different computers that can muddy the water by setting or releasing recirc for one reason or another. Then there are malfunctions like sticky mode doors and bad sensors.
 
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Same test as this morning, manual mode with AC off: recirc stayed on longer than 10min (for the whole drive). The only difference was temperature.
  • This morning was 45F outside: outside temp < cabin temp < target temp (heater on)
  • This afternoon was 70F outside: target temp < outside temp < cabin temp (no heater)
I've never actually used the max AC button so that isn't affecting the results and I would expect a stuck/sticking HVAC blend door to throw some form of error code. When the recirc turns off after 15s is never comes back on until I push the button again so it's not cycling either.
 
I asked the dealer about this, and they forwarded the question to the manufacturer. Today the reply was that "there is a sensor inside the car that measures temperature and air quality and adjusts the recirculation setting accordingly". I asked if I could get more information about how it is controlled, as my car appears to only have a timer to turn off the recirculation (waiting for an answer).
 
Fredrik Lidén said:
I asked the dealer about this, and they forwarded the question to the manufacturer. Today the reply was that "there is a sensor inside the car that measures temperature and air quality and adjusts the recirculation setting accordingly". I asked if I could get more information about how it is controlled, as my car appears to only have a timer to turn off the recirculation (waiting for an answer).
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If you're able to ask, I'm curious what this air quality sensor is measuring. The whole reason I started this thread was trying to keep the air recirculating during wildfire season here and I doubt the air in the car was worse than the 300 to 500 AQI air outside.
 
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