convertible roof leak - BMW 4-Series Forums
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post #1 of 15 Old 12-04-2015, 05:12 AM Thread Starter
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convertible roof leak

Hi Guys, first post here though i've been around lurking for a couple of months.

i got a 420 convertible back in August and this week had a major roof leak...passenger side rear footwell was very wet and i could hear water splashing around under the back window near the rear speaker.

its back with BMW now but i wondered if anybody knew of this problem happening before that could point me in the direction of what to double check with i worry they will simply not recreate the downpour we had at the weekend and just lube up the seals and tell me its ok.....which is fine until we get another downpour.
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post #2 of 15 Old 12-06-2015, 07:15 PM
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Take pictures as proof of the leak and ask bring it into your dealership to see if they can replace the roof. It shouldn't be leaking at all and the ca should still be under warranty if you bought it in August.
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post #3 of 15 Old 12-08-2015, 04:24 PM
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I used to work in a dealership and remember they did a smoke test once to see where the leak is. If you have a humidifier, having it run inside the car when you feel the need to do so can help in detecting them.

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post #4 of 15 Old 12-10-2015, 05:26 PM
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Surprising that it would be leaking when the car is so new. Dealer will fix it I'm sure but the humidifier test sounds pretty fun to do yourself.
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post #5 of 15 Old 01-07-2017, 01:30 PM
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I have exactly the same problem. Took the car to BMW yesterday and they say there are drainage holes under the car that are blocked and want to charge me for the repair!!! Seems like they know there is a leak and instead of fixing it put in a poor workaround. Did your garage resolve it?
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post #6 of 15 Old 05-19-2017, 07:06 AM
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Bring your car to the dealership and have Roof Repair , this can prevent the leakage of the roof.
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post #7 of 15 Old 05-23-2017, 07:24 AM
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I would demand a new vehicle!
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post #8 of 15 Old 08-04-2017, 11:08 PM
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I would love to know what the outcome was?

The trouble with forums (for anything) is that people are quick to describe a problem but seldom return to tell and help anyone else what the solution proved to be!
My friend has just bought a 4 Series 2YO convertible hardtop with the identical symptoms and water dripping from under the car just forward of the left hand rear wheel arch and the sound of water sloshing around as you drive slowly.
Local main dealer wants 150 JUST to look with no advice as whether its a warranty matter or not. They surely must know, or could refer back to BMW for the information? Apparently there are four drain plugs underneath that could take 2 hours to clear. My feeling is that leaks are inevitable and to be expected with such a complex roof that anyway may have been put away wet and the real emphasis should be to ensure these one-way drain plugs which are there for water to escape should first be checked as the main culprit for the water build-up. You can expect blockage on an old car - inevitable caking-up with the dirt and grit of ages but not on a 2YO unless the plugs that have very sensitive apertures to allow water to drop out by gravity, but not come in, have got pinched for example or even only one of them.
For the moment my friend has to ask the selling garage (not BMW) what he has to do.

So, please, previous or other correspondents, what happened?

Last edited by stephenghc; 08-04-2017 at 11:17 PM.
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post #9 of 15 Old 08-15-2017, 03:57 PM
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I have just taken my 2yo f33 to the dealer withe the same problem and they cleared the drains under warranty. The water took 20m to drain. I suspect that the rear window seals are at fault and are allowing the compartment underneath to fill with water.
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post #10 of 15 Old 09-20-2017, 09:44 AM
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I have the same problem with a 2016 420 cabrio. It is going into the garage next week, should be interesting to hear what they say. I also have water leaking from the front of the rear left hand side wheel arch.
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