Even with the blower switch completely off mine will trickle either cold or hot, where ever the temperature is set to. I had my dash apart the last couple days and took the car out. With no controls I couldn't shut anything off so had to put up with a bit on very unnecessary heat, as the case was this time.
I actually rarely use my ac.. it draws a ton of power. That and I prefer windows down anyhow.
Bottom line, it always trickles out a bit. And yes my front window can get foggy about the bottom reasonably often too. Right above the cowl vents. I assume hot air escaping from Underhood.
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