i own a 2001 Durango sport, i buy the car 2 weeks ago, i have rear a/c controler,

my problem is when y turn the heater (front/back) not warm air come from the back only in the front, i drove the car for 2 hours and still cold air in the back, what can be the problem?

thanks in advance for the help.

 

Just a guess, if the 01 is like the 99 then you are turning on your a/c in the back. Mine only has upper rear air not heat.