Bernievarian said:

If I remember well the rear clusters have two ? rubber seals to keep water out of the cluster itself but also from entering the car. Two screws to undo and you'll get it off to inspect the seals, maybe one was crushed/broken. At reassembly, tight the screws evenly, after adding some rubber grease (or vaseline) on the seals, screw thread and back of its washer...
BRs, Bernie
If someone here helped You fix -or better, understand- your issue, hit the thanks icon @ bottom right corner, it's free and makes us feel helpy ;-)
ps: empty and dry the cluster before reassemly ;-)

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PRJ S4 said:

My saga continues....despite saying that my temporary Blu Tac seal along the top edge of the glass/hatch, they still appears to be water getting in somewhere.
I cannot understand how so much seems to be getting in.
If there is no obvious place to see, how does so much collect in the hatch !
I may take the lazy way out and drill a couple of 'drain holes' in the lower edge of the boot lid ( well rustproofed of course !), so at least that will ensure that the water that does accumulate can drain away when I lift the hatch, otherwise there will always be some sitting in the bottom.
I do get slight condensation in the light clusters but it does not stay there for long.
IIRC when I removed the lights clusters I deduced that there was no way that water could get into the hatch from the lights anyway, but there are some owners who are getting water into the boot so that may point to a route for them.
I seem to have spent an inordinate amount of time and energy trying to sort this out.....!!!
That may be one of the reasons that I prefer a car with a traditional boot...!!
Although my 'other car' is also Italian and has other 'quirks'

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Ditto - I am also considering drilling 4 small holes at the lowest point of the tailgate door so any water getting in goes straight to an exit. It seems a quicker workaround to diagnosing the water ingress fully.

I've never had a 'mysterious' water ingress issue like this before on any other car I have previously owned, even the French ones!!!

varesecrazy said:

My TA..owned from new in 2013
No issues...only noticed sloshing tailgate 2 weeks ago.
The lights had been disturbed at MOT (new bulbs)..@4 weeks ago...
at least I can make a comparison..

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I took my light clusters off 3 weeks ago after getting an intermittent bulb dash warning. RHS brake light socket had some corrosion/oxidation build up between two of the metal links which I cleaned off. I then also did the LHS cluster.
The seals weren't in tip-top condition I would have liked (I'm a bit OCD) but they weren't deteriorated either.

At the moment this is my only lead on the water in the LHS light cluster (RHS looks fine) and I'm looking for some sort of puffy self-amalgamating rubber material to fit under the whole light cluster plastic to form a waterproof seal between it and the body & the hole where the wiring loom comes through.

If that doesn't work then the cluster itself must have a crack/hole somewhere

May be a way to see where water is getting in the hatch,lie the 2 back seats flat, remove the plastic cowling from the back of the hatch and sit in the back during a bad rain storm with a torch ????

Michael Dranfield said:

May be a way to see where water is getting in the hatch,lie the 2 back seats flat, remove the plastic cowling from the back of the hatch and sit in the back during a bad rain storm with a torch ????

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LOL... that would be so funny down my street, the trendies will think I've started a new hatchback cult and want to join in

Here's how the drain holes look like on my 2009 GP ...

BRs, Bernie

If someone here helped You fix -or better, understand- your issue, hit the thanks icon @ bottom right corner, it's free and makes us feel helpy ;-)

Bernievarian said:

Here's how the drain holes look like on my 2009 GP ...
BRs, Bernie
If someone here helped You fix -or better, understand- your issue, hit the thanks icon @ bottom right corner, it's free and makes us feel helpy ;-)

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I've got those on my 2006 GP - but I've never seen any water come out of them

When I open the boot and hear water sloshing, I have to move the tailgate up and down (pic 2) to find the point where water will start dribbling out of 2 holes (pic 3) just above the rubber stop on each side of the tailgate door.

It then dribbles out on each side unglamorously (pic 4)

Looking at the bottom inside of the tailgate door it looks convex from the middle outwards - so the 2 large drain holes are pretty much useless as water will only drain out of them if the quantity built-up is sufficient enough to reach them. AND even then only the quantity of water above that volume will drain out of them

This seems a design flaw to me and a designer somewhere unversed in gravity and fluid dynamics :doh:

EVEN putting the 2 little holes on the BOTTOM of the rubber stop holes would have been more effective

UPDATE

Now we have some warm weather I decided to dry out my LHS light cluster which had condensation at the top and liquid sloshing at the bottom.

I removed the fitting to find the wiring connector stained a shade of navy blue.
The 2nd connector (earth?) looks it has shorted, overheated and surrounding plastic has turned brown.
In the socket end the 2nd tab has crud on it and the black plastic around the tab base has signs of melting.

However, my lights have been working ok with no warnings on the dash and the indicators flashing at the correct speed and audible tone warning correct speed/sound.

I took the light cluster apart and inside the bulb carrier there is dried blue residue around the edges and the bottom bulb fitting & bulb body.
I emptied the liquid from the inside and it was blue.

My windscreen washer fluid is blue, but I haven't used my rear washer since before easter when I originally posted here about it not working correctly.

SO - where initially I thought it was rain/jet-wash water getting in the light cluster, it is in fact windscreen washer fluid.

How is it getting inside the light cluster if it just dribbles out onto the rear window and the wiper flicks it off side to side

I checked the rubber boot between body and tailgate and it is fine - no damage, nice and flexible, securely fixed at both ends.

Could the washer fluid supply tube have failed/split in the body and is leaking liquid onto the wiring loom which is then moving along it down in through the connector?

The external 'wrap' on the wiring loom connector looks fine (not wet) with no obvious traces of blue.
Also on the light cluster rear body seal there is no trace of blue.
Nor on the metal area of the body behind the light cluster - no traces of blue or liquid ingress.

See pictures.

Whats concerning is that once I dried out the light cluster and scraped off the blue residue and refitted it - I started getting the yellow warning triangle :bang:
Check brake light & my indicator wasn't working with the audible warning all wrong but the tail light was making a pathetic attempt at flashing

After unplugging/plugging in the connector a few times, I found the sweet spot where it all worked and has been ok since.
I need to take the connector apart and clean the terminals & tabs thoroughly. as it is MOT time

Anyone got any ideas how I get washer fluid in my light cluster without any obvious signs of ingress behind the actual light cluster?

I'm starting to think my GP doesn't like me

Weird....

I took the light clusters out of my leaky MJ.. all appeared fine.