Bill s-type

I have a issue and dont really know what to do. I had the a.c gassed up after it being dry for god knows how long (not long perchaced car) and had it blowing cold from middle vents but red hot through side and feet vents. Was told it could be the climate control module? Also car over heated today and boiled over I let it cool and released the pressure and drove home was fine? Is this linked? Can anyone help please???