Wayne
I would think that all is ok
First when the fresh?recirc is in auto mode its for detecting exhaust fumes and bad air then it goes into recirc mode but will go back to fresh when it as cleared.
The system is very smart and is pretty much trouble free, but do not under any circumstances open that filter cover with it in fresh or auto mode must be in recirc mde if not you will not even know you have broken it and dont let anyone change unless they know that.
i know you have done it yourself but you have been very lucky for it to be still working but it is not broken if flap operates" Lucky man"
Right wayne there is a procedure to check all the flaps etc that they are working and gives a errror code if not however if it is not strong sunlight you will get 2 error codes it is a while since i did it but i think its 21 and 24 sun sensor for both sides.
With Ign off press and hold AUTO switch at same time (you have to manipulate your fingers) hold Fresh/Recirc button then press ign button twice but dont touch brake, panel will light up and the climate will go into check mode release both buttons then press fresh recirce button and it will go through 10 flap modes and air blowing modes and keep repeating till you press OFF then switch off and you are back to normal mode.
Just on more point i dont have the 450 and dont have experience of hybrid, i would think if you are in hybrid mode surely engine not running, engine not running = cold heater i may be wrong buttttttttttttttttt................ someone may correct me
regards Robert