yeah, i just remembered! mine does a "super fog freak-out" sometimes when i turn on the defrost. the windows are fogged up some to start out, then i turn on the defrost and it turns into a can't see a darn thing super fog for a little bit then it clears up fast. i don't recall if it's when i use the recirc or not, or either way?
i think it's the evaporator housing holding water and not draining.