Irg:
Thank you for the reply.
I don't know how the vacumm lines got reversed. This just happened the past winter when heater was on, heat coming from side and center vents (instead of side vents and floor wells).
Now when AC is on, air coming from side vents and floor wells, but not from center vents.
I don't have vacuum leak problems. Door locks, engine shut off etc. are fine.
Do you know the locations of the vacumm lines to the floor wells and center vents?

Thank you

Steve