Why is my Ac system blowing air, when the switch is turned off?

Hi, this is Bo, an auto expert on RepairPal's Car Genius team! It sounds like your Chevy Traverse's HVAC system is doing its own thing. If air is still blowing after the switch is turned off, and it's only coming from certain vents, it could be an issue with the blend door actuators or the HVAC control module. The delayed shutoff could point to a problem with the module or relay, keeping the blower motor running. I'd also check if there's a "rest" function or a setting keeping the air moving for a short period after shutting off the vehicle. If you need any further advice or want help finding a trusted RepairPal shop in your area, please feel free to call us at 877-913-1554.