Helpful info when you have the rear air conditioner system blowing HOT air while the front climate control blows cold. YOU DON’T need the dealer for this easy and quick fix! How to remove the interior panels, A/C blower box assembly and replacement tips to make quick work of repairing a VERY common issue with GM HVAC / AC issues. Suburban Tahoe Denali XL Escalade EXT all have the same issues with blend door actuators, system reset instruction and calibration tips all in one spot!