08 1.9 Door drains? - Archie
I notice that the window on the driver's side comes up damp when it has been down for a short while. None of the others do. I suspect the door drains are obstructed and there is condensation in the door cavity. Has anyone come across this and do they have any advice to share?
08 1.9 Door drains? - Dynamic Dave
Can't recall this ever happening to my previous 53 reg and current 06 reg Vectra-C.

Have you looked at the drains at the bottom of the door to see if they're blocked, or tried pouring water down the window from outside to see if it drains out the bottom of the doors?

Another thought, is the rubber seal on the drivers door actually in contact with the glass and acting as a squeegee like it is with the 3 other doors?