photon

I did try it without removing the headlining. With it hanging down on one side the car was unuseable and, of course, I missed a leak after re-assembly so I really do recommend full removal. Its not too difficult and the car is driveable while you confirm to your satisfaction that the leaks have been stopped. Good Luck!

May I recommend to anyone with this leaking sunroof issue to completely remove the headlining as I feel that this is necessary to fully seal all the points of entry around this strange Webasto Sunroof insert. Its a pain removing all the grab handles, sun visors although the rear rooflight cluster can remain in place as it comes away with the healining. Once the black plastic frame is easy to access simply caulk each of the slots with a suitable sealant ( I used a MS Sealant similar to CT1) I also removed the two springs that assist with the "pop-up"and sealed the square holes beneath as the seat for them also acts as a leak point. 100% dry now after significant Scottish Rain Webasto. What are these slots and holes for?

It’s a very strange design, almost as if VAG wished to devalue older cars with sunroofs. I think that the rubber seal at the lower edge of the fabric air deflector shrinks laterally opening up at each end a “gutter” with the drain holes in it? Why the holes is a complete mystery. perhaps a greater power may explain?

This repair was on an A6 C7 Allroad 2016

I have just successfully completed the process of sealing the lower edge of the wind deflector mechanism and may reports that leak is fixed as tested by a garden sprinkler showering the car for half and hour. So many thanks to all those who have contributed to this fix. A couple of points: I have removed the pair of spring steel components that sit at the end of the wind deflector curtain so that I could seal the pocket that they sit in. That said the sunroof operates perfectly without them. Not sure what their function is, but perhaps as an anti-rattle for the sliding panel? Anyone? I dropped the headlining on the passenger side mostly so that I did not have to remove the trim and potential damage the airbag on the driver-side A pillar. With Sun visors, grab handles and the central overhead control panel removed I could just about apply gaffer tape to the underside of the perforated mounding that holds the rubber seal of the fabric air deflector, this as recommended here prevented any leakage of sealant to the underside. The sealant I used was a “ modified silane” or MS sealant/ adhesive such as CT1, but many MS sealants exist now and are popular as they have a moisture curing capacity and don’t mind damp condition. I placed the mastic gun tube in warm water for 30 minutes to make it flow reasonably freely as it was 4C outside when doing this. Again thanks to all contributors, demonstrating the power of the group.

Driving in Greek Mountains on dirt track using "Allroad" setting when a warning message beeped " Suspension Too Low" Stopped, examined and found all look fine with good ground clearance. 5 minutes later the rear N/S airbag exploded with a shotgun strength bang ! Now the rear suspension was down with only minimal ground clearance quite insufficient for the terrain resulting in damage to rear undersides and worse, a significant fear that we would not be able to get out of the dirt road network to a more level tarmac surface. This problem and subsequent damage to a low-mileage 2014 A6C74G Allroad was caused by a snapped plastic drop link or rod connecting the level-sensor to the rear N/S suspension. The CPU thinks the car is too low, tries to further inflate the air-spring and the explosion results, potentially stranding me in uninhabited mountains. Now I have the car on the ramp. One knackered airbag with no stock in Greece other than £800 from the stealership, and damaged to the rear skirt and underbody parts all because of a "weak link" Examination of the other three links reveals that two are already bent and will doubtless stress-fail in due course. Anyone else had the same problem? I urge owners to check and replace these links although at the moment I cannot locate a source, only the complete sensor and link kit at £80 a corner. Totally p***ed off and cross? yes, but grateful to be able to drag the A6 !Removed! over rocks and scree using 150kW of engine. Thinking of fabricating a better substitute, certainly, unless others have beaten me too it.