Heater is getting stuck on

[maliveline]

Sometimes I will be driving down the road and you have the heater on high and it blows hot air which is normal... but if say you stop somewhere and get out of the car and get back in and turn the vents on all the way to cold, the air will still be blowing at the hottest temperature. any suggestions would be appreciated.

[maliveline]

****UPDATE*****

So i'm finding out this about my A/C... It works when I select auto and switch the dial all the way to "blue" but when I just turn it on to the fan on III then and the other dial to the blue it doesn't turn the A/C on. can i get a fucking reply someday?