Sorry if this has been previously discussed. The rear A/C vents can easily be knocked out of place or damaged by the center headrest in the center seat. By trying, you can fold the seat down and also move the seat forward using the rear seat entry latch. In this position, the center headrest will reap havoc on the vents. The drivers seat will prevent this if it is in the full rearward position, but if positioned forward, the vents provide the stop for the seat movement and they just weren't meant to. BP