Heater flaps leaking
 

I've got a A4 B6 convertible which blows warm air on the passengers side. It gets hot when turning temperature up. Flap is moving, is it possible that the actuator has slipped so it doesn't fully close over the heater coil?
I've noticed that the corner of the flap appears cut away, is this normal?
Otherwise has anyone come across half the ac coil not getting cold?