Looking over my recently acquired Sprinter 2006 van based motorhome (that has only done 1300 miles as sat in dealer's showroom) and noticed water drainage channel below windscreen blocked by some muck. Cleaning out the channel shows that on passenger side there is a nice big round hole and water drains down inside the wing. On the driver's side no corresponding round hole more of a spout that drains into the engine compartment. Anybody know why is it different on each side - is mine unusual - and what are the consequences?