replaced batery and air does not come out the vents
when loss of power to hvac unit sometime the hvac actuators need to be recalibrated. possibly try to remove the hvac control fuse under the driver rear middle seat for a minute and reinstall, turn key on and do not touch any hvac module buttons for another minute to allow actuator to recalibrate then recheck to see if repaired. if that does not fix it you will need to take it to a gm dealer to get it recalibrated with the tech 2 scan tool.
had battery replaced same issue removed HVAC fuse # 39 under rear seat waited 1 minute then replaced fuse Turn on ignition do not start engine. Wait 2 minutes then start this will recalibrate the actuators I got this from one of the web sites it worked just fine. All vents work correctly now.
I tried the all the above and still it did not work
Never heard of a driver rear middle seat.....??????
Cant even get under the rear seat. Where is the fuse?
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