I am going to suggest you check to see if the radiator fins and tubes are not clogged with debris blocking airflow. I cleaned the radiator on my NT regularly, it seemed to accumulate dead bugs and dandelion fluff.
I don't really remember my NT putting out excess heat from the vents, but the Y-pipe did kind of cook my right foot on hot days, especially if the wind was from the left side of the bike.
I don't really remember my NT putting out excess heat from the vents, but the Y-pipe did kind of cook my right foot on hot days, especially if the wind was from the left side of the bike.