Hi, I've had my MB6 for 3 years now and it has been stood for last 2 years. I just got the car out recently and got so much work to do, but first need to sort the leak on the roof and spare wheel area in boot. Both the roof and boot leaked ever since I got the car but I did manage to fix the roof leak but now it is leaking again and I never got to find the cause of boot leak.
Here is what I have done so far.
3 years ago when I first got the car, I noticed the roof lining from front drivers side corner was wet. So I removed the roof lining, removed the sunroof drain tubes, poked a metal wire in. I then removed the roof strips and found a small hole on front driver side (where the roof lining was wet). So I applied lots of tiger seal to block the hole and also along the whole roof strip area on both sides then fitted back the roof strips. I never put back the roof lining and for a year and half my roof never leaked.
I then moved onto the boot so removed the tail lights, removed the tail light seals and applied clear silicone on both sides then put back lights and tightened up. I also removed the rear bumper and applied silicone onto the vent/flap thing from outside and also inside. This still did not fix the leak onto the boot.
Now 2 years later, after moving the car. I have found the rear half of my roof is wet and also the boot spare wheel area is rusty. I have examined the boot leak and I suspect it is leaking from two areas. On the passenger side, just next to vent/flap thing, there is what I believe it passenger rear sunroof drain tube which is where the leak starts from. There is also a little bit of rust around that area on the arch but the car has been parked up so I doubt it could be the arch. Are the sunroof drain tube prone to cracks over time? I have attached a picture to show you what I mean.
Now on the driver side, it's difficult to explain but after lifting up the boot seal, I found a bit of rust which is where I think it may be leaking from. I removed the boot seal completely to check if there is any rust anywhere else but thankfully nope, just on where I suspect the leak is.
I also noticed that my tailgate hinges are rusty and cracked, could it be that water is passing through them causing the rear half of my roof to leak? Any help would be appreciated