"Flippy door" Issue?
I am having an odd problem with my 2006 Maxima where when setting the thermostat inside the cabin is just whacky. When setting the temperature to coldest 18C (or 60F), it blows cool air. When changing the setting up to just 18.5C (or 62F), the car starts to blow hot air into the cabin. This affects both the left/right controls and it doesn't matter if the two sides are matched or set separately. It doesn't seem to get any hotter if I increase the temperature any higher up to the maximum. I cannot test to see if AC is affected or not as spring/summer is still indecisive and it doesn't appear to be hot enough outside for the AC button to do anything...
So, what i'm wondering is it a "flippy door" that controls how much heat makes it into the system or something else that needs resetting? And if the first, any idea how to get at it?