Rain ingress through the passenger side rubber seals. Dead easy to see where it's comgin from as it's a torrent! But curing it may be harder, has anyone has problems with the n/s door rubber being a bit scrunched and not sealing properly?
It's not so scrunched that it should make a difference but it is...if that makes any sense! I'm loath to replace it all if there's a fix. Door looks to be aligned ok and I've tightened the glass too.
Which of your vehicles are you referring to Wrinks.
Would injecting some silicone through a specially made hole into the cavity in the rubber bulk it out at bit.
Obviously you would have to leave the silicone set for a few hours before closing the door - just my 2 cents