I can't see the air-conditioning compressor vent........
That's because they are on the rear face of the sponsons, and there is no photo covering that one. However perhaps you have insider info?
Having flown a couple of Ozzie 225 with aircon, it is very nice even in S of France temperatures, but of course it does cut down the payload a bit - instead of having about 750lbs more payload than the 92, it takes it down to a mere 500lbs more...
HC