[V8] Coolant misting into the cabin

[Karl D. Middlebrooks]

New problem for V8 #1 that just started today. The windows appeared to fog up, but it's not regular condensation; it's filmy when I wipe it off, and I placed a towel over the top vent in the dash for about 30 seconds to see if it collected anything, and it smells strongly of coolant. I checked my levels when I got home, and it's a tad low, but not remarkably so, and I didn't immediately see any place that was wet. Despite being relatively new to actually working on cars, it struck me that this is probably a Bad Thing. 

Leaking heater core?