Roof leaking (still) - Mercedes Benz SLK Forum

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#1 Old 06-17-2018
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Question Roof leaking (still)

An update (and question) regarding my on-going roof leak -
Having been told, by a local Indie, that R172 roof liners cannot be removed, I went to a company called Autoclass in Milton Keynes for a second opinion.
Their workshop manager advises me that the roof liner CAN be removed,and the closure latches adjusted, but that in his experience, that will not solve the problem, which is caused by a leak between the metal/glass sections of the roof.
He said he is 95% sure this is the problem, which is only cureable by an injection of wax into the roof to prevent water ingress.He also said this ,due to lack of tooling, can only be carried out at a main dealer.He also said it is a known problem, and MB had forwarded a Technical Information Document to the dealers outlining the 'cure'.


My question (well two actually) - has anyone heard of /experienced this 'cure' and, if it is a known problem, with an official rectification, would I be pushing it to expect MBUK to contribute a 'good will' percentage of the cost?

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#2 Old 06-17-2018
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Anything in the R172 service bulletin (the sticky)?

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#3 Old 06-18-2018
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#4 Old 06-19-2018
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Have read both the above threads, nothing to gain there and there doesn't appear to be in the 'sticky'


Have contacted my main dealer - no mention of 'wax-injection' , the only suggestion they make is taking the roof off and replacing the seals at 1550 inc vat!. Quite expensive to cure a few drops of water! I have contacted MBUK to see what they have to say
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#5 Old 06-19-2018
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Good luck , from my experience Mb are as tight as a ducks , you know what I mean.
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#6 Old 06-19-2018
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Good luck , from my experience Mb are as tight as a ducks , you know what I mean.

At present all I want from them is agreement that the 'wax-injection' cure exists!
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#7 Old 06-20-2018
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Have again contacted the main dealer, they confirm that they will carry out the wax- injection but still want to renew the existing rubber seals! I think I may try another dealer
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#8 Old 06-20-2018
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I was quoted 1500+ for changing the rubber seal while the first time was 250 with extended warranty. The first rubber seal replacement did solve the leak problem for just over 2 years but leaked again. The main dealer then advised changing the whole roof with MB "50% goodwill contribution".
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#9 Old 06-21-2018
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Not being funny but sometimes you wonder how good these dealers really are . How long has the car been on the market , surely they should know what to do by now . I would buy the seal (if you can) and take my time and do it myself and if possible rope in another knowledgeable member to help .
Good luck.
Ps I thought my Triumph Stag was a money pit .
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#10 Old 06-23-2018
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Okay, went to another dealer, according to their tech - the leak will be cured by removing the roof, resealing the glass (3 applications of sealant) then replacing the roof,checking the alignment, water check to ensure no leaks and finally a road test for wind noise, all in all 3 days in the workshop and a charge of 1300 approx - don't know whether to go for it or not
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#11 Old 06-23-2018
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Thats a lot of money . Do they guarantee to fix it or no payment . Try some diy you have nothing to lose . What about an Indy.
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#12 Old 06-23-2018
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OK exactly where is the leak occurring ? If at the joint between the roof and windshield frame (over left thigh) it is probably not the glass.
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#13 Old 06-23-2018
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How much is actually getting in?If it is truly a "few drops" I say just live with it unless you leave the car outside frequently during heavy rains. I garage my SLK so unless it developes a rather serious leak I doubt I would ever go for any expensive fixes for a drop or two here and there.
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#14 Old 06-24-2018
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The problem is - the car lives outside (1980's British garages don't fit 2013 cars) and the water runs onto SWMBO in the passenger seat - not to be advised, she gets a bit upset. Both the local indies say the problem is with the seal between the glass and the metal of the roof,not the rubber seals between the roof and body of the car, and can only be rectified by the main dealer?
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#15 Old 06-24-2018
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Ouch thats rough. Hope you get it sorted.
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#16 Old 09-23-2018
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Well it seems the problem's been sorted, Northampton dealer had car for nine days(!) took the roof off, applied two coats of sealer to the joint between the glass and metal sections of the roof, re-fitted it and the leak is no more! Two years guarantee and MBUK came up with a 50% 'good will' payment (eventually)
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#17 Old 09-25-2018
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Great work grimtree. Well done.

I've had a leak on my 2014 250CDI for a couple of years - orignally mentioned it to an MB dealer who found nothing!. Mine is definately at a section between the door glass and the roof rubber, almost exactly at the top of the A pillar.

I've tried to gummi it but it still leaks - not massively and mainly at speed when the rain is 'forced' through. It's a pain in the ar5e but I think I'll have to live with it.

Hey ho - glad you're sorted.
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#18 Old 09-26-2018
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My leak(?) was on the roof itself, between the glass and the metal section, perhaps your door seal problem could be cured by adjusting the height of the window?
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#19 Old 09-26-2018
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My 2012 SLK350 had roof leaks and they tried to stop them by drilling holes in the roof and injecting a sealant. The procedure failed, and Mercedes replaced the entire roof. The leaks stopped.

I had a leak between side window and the rubber seals above the window in my 2015 SLK55. I closed the gap above the window by pushing the seals back into place and then I applied several drops of Chemours Krytox GPL105 to both side of the gap. The gap has remained closed for more than a month and the leak has stopped.
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#20 Old 09-27-2018
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Two with a leak , thats unlucky.
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