Guys, my vents are not working in my Regal ( with AC) . The AC system is not charged yet. I have the vacuum lines hooked up to heater valve (gray) and the purple is properly hooked up to the vacuum pod and carb full vacuum port. I cannot get the vents to work. Only defrost and floor. Before I installed HVAC box, I checked all vacuum pods and they worked. Also all doors were free and moving easily. The slide control unit is moving the round thingy with the Maze looking piece. This is a first for me. Will it blow out vents on MAX AC without a charged AC system? I'm suspecting a clogged vacuum hose but unsure. I'm hoping someone has an idea