2015 Tahoe weird a/c recirculate/fresh air issue

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busterw

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OK, so I sold my 2010 and bought a 15. Something I've noticed on hot days when I crank the truck and the a/c is on, if I have recirculate turned off, it still blows with recirculate on (really high air volume) even though the light is not lit up. I can hit the button to turn the light on and the air volume doesn't change. Hit it again to turn the recirculate off and the volume kicks down.

Is this by design during hot outside temps?

Thanks!
Buster
 
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busterw

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When it's colder outside, it doesn't perform this way and when the light is off, the volume is low, hit the button, the light comes on the the air volume kicks up.
 

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