The 2001 Leisure Travel Van that I just purchased last fall has a broken cover on the side. I attached a few pic below.
It appears that this "vent" is likely a roof drain, because I was looking at the roof mounted AC unit which is mounted in a depression in the fiberglass roof, and I can see the other end of this drain hole in the AC depression, in fact theres one drain hole on each side of the AC housing depression.
So it looks like the cover on the side is meant to act as a venturi to suck out any water in the AC depression when the vehicle is travelling down the road.
Is it important to replace this drain cover? If so where would I look to find a replacement?