rear a/c ? 03 denali

[deucebig86]

my rear air on my 03 denali doesn't work... it blows but not cold. front a/c is ICE cold and will freeze you out. has been like this since ive owned it but i was wondering if there was something common to check. if its an easy fix that would be great, if not no big deal the front blows hard and cold enough to cool the whole vehicle

 

[Jounier11]

Take it to get checked out all you will spend is like no more than 25$ or are u to cheap???