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- Wolfpack
- Member Since: 25 May 2019
- Location: Norfolk, UK
- Posts: 473
LISTEN for the Windscreen leak!
Ok I have yet to fix the leak but I believe I know where it actually is.
After overnight rain I went to the car that had been prepped with kitchen towel wedges in every suspected nook and cranny. Including around the now dried out carpets mentioned on another thread.
The only damp paper was hanging from the head trim right in front of my eyeline.
I poured some water into the ‘gutter’ generated by the glass and the rubber and watched the bead very slowly drop preferentially, about a foot inboard ……approx in-line with my soggy tissue observation.
So I started thumping gently the top of the windscreen glass with the heel of my hand.
LISTEN to the attached video…
[url] ?si=uNCoT4q1z-xRS0Y7 [/url]
(Appologies for the quality I am no Steven Spielberg**)
Also notice at the end of it, I created a bubble in the gutter and squeezed out some droplets onto the inside of the windscreen in the same position as the noise change and soggy tissue.
Methinks I’ve found the exact leak point….now can I seal it????]
Time for …..Captain Tolley’s Creeping Crack Cure.
** Those eagle eyed will no doubt spot the presence of the telltale droplets before I started thumping.
This was my “take2” ….after I fell off the ladder swearing profanely the first time I did it. That video was too funny and foul mouthed to grace this forum.
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- Mole HD
- Member Since: 18 Nov 2024
- Location: Orkney Islands
- Posts: 586
Your clever technique for finding the gap in the sealant would have been worth all the swearing, I'm remembering it in case my windscreen ever has a leak
Let's hope Cap'n Tolley with his one leg and a case of the creeping cracks can cure it -
- Wolfpack
- Member Since: 25 May 2019
- Location: Norfolk, UK
- Posts: 473
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Update….after dousing with Captain Tolleys Creeping Crack Cure the ‘sound’ on the windscreen has changed ….my thump is now a consistent tone across the screen. Is it too soon to be optimistic?
Waiting (nervously) for a downpour having removed all external shelter.
Looking forward to driving my Discovery, without a towel across my lap.
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- Chillyphil
- Member Since: 07 Jul 2025
- Location: Paignton
- Posts: 46
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- Chalkey
- Member Since: 23 Oct 2017
- Location: St Helens
- Posts: 222
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- Wolfpack
- Member Since: 25 May 2019
- Location: Norfolk, UK
- Posts: 473
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Chillyphil wrote:
Great work "Wolfie".
Don't be surprised if you need to dose with Tolleys a few times, if the cracks are too big, a number of applications can be required.
Phil
Thanks for introducing him to me.
Yes I’ve done 2 applications already…but prepared to keep doing it if necessary,
It’s clear this leak is different to the deluge one I had 3 years ago that necessitated the screen refitting.
This is a seep, which puddles over time in the edge of the head lining and then drips with car movement ….onto my trousers
It tends to be worse after sustained drizzle rather than a short sharp downpour…suggesting it is a sloooow ingress like a small hole. The video also supports this, as my thumping produced a small water bead in one location of the rubber seal. It makes me wonder if this time it is just an 8 year old rubber seal damage/failure?
Last edited by Wolfpack on 7th Nov 2025 11:27 am. Edited 2 times in total -
- Wolfpack
- Member Since: 25 May 2019
- Location: Norfolk, UK
- Posts: 473
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- Mole HD
- Member Since: 18 Nov 2024
- Location: Orkney Islands
- Posts: 586
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Rather than a design fault...although I've never liked the fad for gluing windscreens on rather than fitted in a rubber seal... I'd more suggest that's it's an assembly line flaw where the seal is applied from bottom up leaving the gap (however small) at the top of the screen rather than the bottom.
Over time, the sealant will degrade or come unstuck, especially with heated screens. With the gap being at the top edge, it'll be more prone to leaks. It seems that the Discovery has suffered more than other brands in this area. JLR are obviously aware of this fault in the assembly line process and have been for some time...hence the recall or free replacement screens for some affected.
It's only the Discovery 5 that seems prone to it... as far as I know...but it happens on all models since the D5 was introduced...and not all of the models/variants for any particular year of manufacture have the problem so it's difficult to pin to a particular model or year...very strange how it only effects 1 in a few thousand...bad batch of glue, change of windscreen installation methods or a lack of sealant applied in one or more assembly plants?
Who knows?
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- benip
- Member Since: 01 Jul 2022
- Location: Surrey
- Posts: 1
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- Mole HD
- Member Since: 18 Nov 2024
- Location: Orkney Islands
- Posts: 586
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Old Cap'n Tolley will be wondering what the hell is happening with a rush on recent sales...I don't have a leaky windscreen in the Bling Barge (yet)...but it certainly sorted out a nasty little crack in the edge of the plastic shower base in the downstairs bathroom
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- Chalkey
- Member Since: 23 Oct 2017
- Location: St Helens
- Posts: 222
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- Wolfpack
- Member Since: 25 May 2019
- Location: Norfolk, UK
- Posts: 473
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Mole HD wrote:
Rather than a design fault...although I've never liked the fad for gluing windscreens on rather than fitted in a rubber seal... I'd more suggest that's it's an assembly line flaw where the seal is applied from bottom up leaving the gap (however small) at the top of the screen rather than the bottom.
Over time, the sealant will degrade or come unstuck, especially with heated screens. With the gap being at the top edge, it'll be more prone to leaks. It seems that the Discovery has suffered more than other brands in this area. JLR are obviously aware of this fault in the assembly line process and have been for some time...hence the recall or free replacement screens for some affected.
It's only the Discovery 5 that seems prone to it... as far as I know...but it happens on all models since the D5 was introduced...and not all of the models/variants for any particular year of manufacture have the problem so it's difficult to pin to a particular model or year...very strange how it only effects 1 in a few thousand...bad batch of glue, change of windscreen installation methods or a lack of sealant applied in one or more assembly plants?
Who knows?
.
But how come they leak again, after auto glass, National windscreens et al refit them ‘properly’?
Mine lasted 3years after they refitted it…..there must be something else that’s causing the repeat problem?
Oh and by the way …I bet I haven’t used my front heated screen more than 4 or 5 times in the 6 years I’ve owned the car…so I cannot believe it’s that wiring compromising the sealing. -
- Chalkey
- Member Since: 23 Oct 2017
- Location: St Helens
- Posts: 222
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