Good evening.
I have opened my boot door on my W166 and there is rain water running out of the 2 access holes at the bottom of the plastic door liner. It’s not screen wash water (as that’s a dark blue colour). This is rain water. Has a rubber seal gone possibly?
Does anybody have experience of this, or know of a remedy please?
Thanks

The choices are:

- rear wiper mounting
- door perimeter seal
- glass perimeter seal

Try looking very closely at the door and glass perimeter seals. If these don't turn up anything, try spraying water onto and around the rear wiper mounting to reproduce the leak.

Thank you Chassis, really appreciate the response. Will take a look.

I would think the taillights to be a prime suspect.

That's where id start looking first.

Thanks Zuffen...Will check these too.
appreciate your time retaken to reply.