a/c blows hot air through passenger vents on 2005 Cadillac Escalade

when my a/c is on air comes out cool everywhere except out the passenger side air vents which has heat coming out why is this

Asked by for the 2005 Cadillac Escalade
you have a problem with your temperature control on your Escalade. You need to have the Climate Control Computer scanned and the data stream inspected to see what door(s) are not operating correctly. Best of Luck!