2003 Chevy Trailblazer
V8

 Battery replacement
work done to repair = None
tech = JK
question = After having the battery replaced the dash vents will no
longer blow air.


JK:
I will need a little more info to be of some help.
Is there airflow from any vents (defrost, vent, lower)
Is this the automatic or manual a/c system?
Any more info will be helpful for me to assist you.






VISITOR:
Thanks for your quick response.

There is air flow from the defrost, lower and the back air vents.  The dash vents
seem to be the   only area without airflow.
Not sure what you mean by "the automatic or manual a/c".  Sorry.

Thanks.

JK:
The automatic system controls air temp and delivery automatically, the manual
system you must  control yourself. Sounds like you have a problem with the mode
actuator. Sometimes this happens after a battery is replaced, or after trying to jump
start. Fist thing to do that usually   works is perform a reset and calibration of the
mode doors and control head.
With the key off, remove the HVAC B, and the HCAV 1 fuses from the rear fuse
block under the   second row seats. Wait for at least 1 minute. Re-install fuses,
start truck and do not touch a/c  control head for 2 minutes. Shut off truck, re-start
and check for normal operation.

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