AC works but will not blow from front air ducts. HELP! on 2002 GMC Envoy

air does blow through top and bottom vents

Asked by for the 2002 GMC Envoy
Mine did the same thing; Changed the mode door actuator and now it works.
I have problem with chevy truck driver's side only blowing hot air, when on cool. pass. side will cool.
You need to change the driver side temp/blend door actuator. It is the bottom one under the center dash. Just over right side of center hump. Very simple, Do not plug the connector back in the new one until it has been installed,(mounted).
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The acuators that control the flow of air needs to be replaced.
Wow really, not the LH blend door actuator. Read his response from last year, hope it's fixed by now.
under the steering wheel you will find a plastic cover with 4 screws, remove it and change the direction of the air manually, therewith you have to purchase a new AC control system