Every winter I've noticed a cool breeze on the back of my head that feels as though it is coming from behind me. The heater is putting out plenty of heat from under the panel, actually makes your legs and lower body uncomfortably warm while the back of your head and neck are cold. the back heat vents in front of the back seats, floor level, do not put out much heat. I've tried plugging the vent in the hat rack area. The gaspers all seal well and the air does not seem to come from the gap between the interior panel and spar. Basically, I can't figure out where the air is moving from. Is it simply the thin windows transferring cold? Anybody have this issue in an older bird? The 64 had crude heat outlets, but I'm not sure that is the problem. Maybe I need to take someone along to sit in back and figure it out, but perhaps someone has ideas. Was not as big a problem living in Georgia, but between Northeast Winter and hair loss, it's time to track it down.