4 Wheel Drive/SUVs: rear a/c blowing hot air, yucon denali, modes change

Question
2002 yucon denali is blowing cold out of the front vents but not the rear i have replaced the compressor for a unrelated problem does anyone have any anwsers that can help me

Answer
It may be an actuator on a diverter door inside the rear A/C unit. I have aslo seen switches go bad in the rear seat A/C controls and cause this issue. Make sure all the modes change from the rear control as in air to the top and to the feet and hot cold setting even though the cool air doesn't work. Make sure if you turn it to heat it actually starts to put out hot air instead of just no change there either

matt