why is my car only blowing hot air?

my ford ka's heater is only blowing very hot air out. even when i turn the temperature to the coolest setting, the air remains very hot. i tried to use the air conditioning but the same thing happened, only hot air. the ventilators were very hot and when i turned them around to close them, they were very hot. any ideas on how to fix this?
my ford ka luxury is a 2006 model.
would appreciate any feedback.