I'm not sure my AC has a vinegar smell but I think I have the same occurance in my car.

Oddly enough this is another reason why I love the Crossfire. Confused?

The closest I can describe the smell of the AC in my car is that similar to an art museum of which I used to go. It was across the street from my college so I went frequently. The Museum of Fine Arts in Boston had a large collection of Rennaisance art. And in that gallery it had the same faint 'egg' smell. I asked my architecture proffessor about the aroma and he mentioned the museum had some of the strictest HVAC systems and that smell was comming from types of HEPA filters.

So years later in the summer when I'm enjoying the AC I can only attribute the smell to good engineering from the Germans and a good filter.

Now what I've noticed as well is during the colder seasons when I put the heater on the smell has a faint wood smell to it. Like a fireplace. No burning plastic or battery smell only a pleasant wood burning smell. I always wondered how they achived that. Cause I love it!