Hello list ! Last night I replaced the vacuum manifold under the hood on the passenger side, and that still did not fix the problem. I am really running out of options here. My last course of action would be a "band aid fix" that is pulling off one of the footwell tube and attached it to the other end of the "T" connector that goes to the center vent pod. As mentioned above, I disconnected the seond tube and sealed the "T" connector and I do get air from the center vent although not as strong as it used to be, which makes me conclude that the vacuum pressure is not enough to fully open the flaps. Any ideas, opinions or suggestions, anyone ? Thanks !