Air Blend Actuator Location????

HELLO TO EVERYONE, I'VE GOT AN 02 ENVOY SLT AND MY PROBLEM IS NO AIR IS COMMING OUT ON THE VENTS ALTHOUGH I CAN HEAR THE BLOWER RUN SO I ASSUME IT'S THE BLEND ACTUATOR AND NOW MY QUESTION IS WHERE'S THE ACTUATOR LOCATED AT AND WHAT TO REMOVE TO GET INTO THE ACTUATOR ? YOUR HELP IS MUCH APPRECITED. MY EMAIL IS [email protected]