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 10:17 PM.