1998 Corsa Diesel LS. Bah. I originally thought that the sunroof had only two (back) drainage pipes - now it appears there are four. Can't find access to the passenger-side-front pipe, although I have seen it drain from there. There's a pipe in a barely-accessible hole next to the driver-side door, once you take the carpet up. The pipe doesn't seem to plug into a larger pipe, as they do at the back. Is something missing, or does it just drain into the bodywork...and outside. Sounds crazy.