GMC Repair: Rear A/C, gmc yukon denali, 2001 gmc yukon denali

Question
The rear A/C to my 2001 GMC Yukon Denali (Vortec 6.0L)has stopped blowing cool air.  It only blows hot air no matter what setting.  The front A/C is still working fine.

Answer
Hi
First Low A/C system freon charge CAN cause this problem.
Next-
The Rear HVAC controller is PROBABALLY setting code(s) which SHOULD be retrieved.
That being said it is PROBABALLY the Rear HVAC Temperature Actuator that is your fault. It is a kinda common issue.
I hope this helps.
Follow past back, if needed.
Pawl