2002 Trailblazer A/C won't blow thru vents.

[thebrug]

My '02 Trailblazer won't blow A/C thru the vents. You can hear the blower running but it only blows thru the de-fogger up by the windshield. any suggestions?

[maxwedge]

Assuming there is no reponse to changing the mode positions on the dash switch, then the control head or one of the door actuators could be the issue. Is there any change or response using the heater, will it come out the floor?

[wardak33]

try pulling all the HVAC fuses out for at least 30 seconds then put them back in. Then give it a minute or two so the actuators can reset themselves.