HVAC Air Inlet Door / Actuator Modes
I recently looked into the well known issue of the HVAC air inlet door and actuator which is located behind the passenger cabin air filter on Cobalts/G5s. I was wondering if anyone in the know can confirm - regardless of the setting of the HVAC recirculation mode being on or off when the ignition is ON, does the air inlet door ALWAYS CLOSE when the ignition is shut off, i.e. in engine off or accessory or completely off key position? I wanted to understand whether this door is opened and closed each time I turn off the engine and/or ignition completely. If it does always close, by which point does the air inlet door close (e.g. as soon as engine is off, or accessory position, or ignition completely turn off)?
Since I rarely if ever use HVAC recirculation mode, it would mean that the air inlet door would always be in the open position while the vehicle is in operation, but if the system logic is such that the air inlet door actuator always CLOSES the air inlet door when the ignition key is not in the engine run position, that would mean that the actuator is constantly being operated frequently.
Also, is it true that there are three HVAC actuator modules on these vehicles? I understand there's supposed to be 2 actuators for HVAC mode control and HVAC temperature control (AC-Delco appears to call this actuator a heater blend door) both of which are easily accessible to the right of the driver's foot well on the side of the centre console, once the knee bolster panel is removed. But the third actuator for the HVAC air inlet door is located in a difficult to access position inside the right end of the dash.