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Front air vents not work but rear ones are



I recently replaced the battery in my 2004 GMC Envoy. The day after when I went to start the car to let it warm up, I noticed that there was no heat or air coming from the front vents. I then turned the rear vents on and there was air flow. Any help on how to fix or what the problem is would be appreciated.

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A re-calibration may fix you up. Try disconnecting the battery for
a few minutes. Reconnect it. Or remove the HVAC/ECAS fuse for a minimum of 10 seconds.

Re-install the HVAC/ECAS fuse.


Then turn the key to the on position, but
don't start. Don't touch the HVAC controls. Let them do whatever that
want to do. Air flow may change outlet points during this time. Wait
about 1 minute. Turn key off. Sometimes opening and closing the door can
make a difference as the vehicle controls see this as "cycle"
completion. Next start the vehicle and drive it a short distance and see
how it performs. You may indeed need to replace an actuator.

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