If you open the roof fully and you will see a black channel between opening and body, look towards the back of the car down that channel and you will see a small hole one either side, if you poke you head through the roof you will easily see them

Thanks Drf.

Looking at them like that will tell you if they have got really bad, but not what they look like underneath or if they are leaking.

You will see if they are blocked for sure and if they have corrosion around holes, best policy is pour a cup of water in there and see if it appears out behind the rear wheels or if it just holds. Only way to tell in reality is pull headlining but they won't want you doing that. if it has a cloth headliner you will see staining around grab handle area's if its leaking. Mine has leather so harder to see

Thanks DrF

I suppose the other thing to do is take my moisture meter with me to test the headliner around the handle.

I would think that would be a good shout

There’s already an onboard moisture meter: -you open the rear door slightly, and water gushes out!  “If it ain’t broke, don’t fix it” -where’s the fun in that?

DrF wrote:

I am still confused here, surely the drains still exist if you have a fixed pano roof, the only time they wouldn't exist is if you had no sunroof at all? If you look at the parts for the roof the sunroof channel for fixed pano roof still has drain points???

OMG we will then need an un-gloat emoji  2018 SE SDV8 4.4 Byron Blue

here's a pic showing the drain pipes,

I would have thought the fixed glass roof is bonded into place much like the windscreen and won’t require drains, happy to be corrected however  Jonathan

2007 Defender 90 XS Hardtop

i concur J...  ... - .- -.




Y. O. L. O.
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It would make sense and be the same as everyone else with a glass roof (not opening sunroof) if it was just sealed in like the windscreen or indeed the rearmost windows (load space side windows) but then again JLR and common sense in the same sentence  Geoff

It's just occurred to me, are there only two drain pipes, one each side in the middle?
Or I suppose more accurately at the rear of the opening bit.

I may be missing something obvious here, but what happens if you park on a slope, especially nose down?

Surely any water running to the front has nowhere to go except overflow into the headlining.

My D4 has 4 drains, one in each corner, which makes far more sense.
I know there are well publicised issues with the D3/4 drains, but I keep them clear and at least know that if I park on my sloping drive the water should at least go to one of them.

I just posted this link in the other sunroof drains thread, but repeating it here in case it’s useful:

https://a.aliexpress.com/_EHlSAOU “If it ain’t broke, don’t fix it” -where’s the fun in that?

Nasher wrote:

I may be missing something obvious here, but what happens if you park on a slope, especially nose down?

Surely any water running to the front has nowhere to go except overflow into the headlining.

I have just been out to test mine and poured water into the front either side with the sunroof open. Water drains to both front wheel archs so they must be there somewhere. It may be hidden behind the very front glass and drain to the outside of the vehicle via the side windscreen channels?. I cannot find any images or mention of front pipes?

Last edited by qwerty on 2nd Jan 2025 2:35pm. Edited 1 time in total