We didn't get your particular model of Opel here in the US, but, just going by the sunroof that was on the Manta A series, with the top in it's open position, there may be as many as 4 drain tubes. One at each corner. Try looking for an open hole that seems to be there for no reason. I'll try and post pictures of the Manta one tonight.Dear Friends,
I have an 2000 model Opel 1.6L Club Class. Off late the sun roof has started to leak and I understand that there is a drain pipe but I was unable to locate it. Can someone help me please.