Yes, I've done all that at the last annual. There is plenty of heat coming out of the vent in the back. But, the aftmost seats really get cold due to what feels like a cold draft. I saw something recently that suggested that the cabin air exit on the A-36 is not in a good location and doesn't promote enough flow to allow the hot air to disseminate thoughout the aft cockpit. Don't know if this is true or just a theory.