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In the most pain in the ass spot possible, to the right of the evaporator core and heater core. If you look underneath the dash there, the flap you see behind the grille is the fresh air/recirculate flap...that is ahead of the blower motor area. So nearby of course is the actuator. Here's a pic from underneath, during replacement
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Richard
Not sure if mine is out or not. I know I can hit the button and you definitely hear a difference in the air flow, but temp doesn't change. My ac is not getting cold enough and someone suggested it could be flap not closing all the way.It can be a pain to replace and some manuals will tell you to pull the dash. Totally not necessary.
Here's a writeup I did on replacing it, which is where that pic came from: http://www.chevytalk.org/fusionbb/showtopic.php?tid/170970
Richard