[W126 Coupe] Leaking Front end!

[Brad Cross]

Hey guys, wonder if I can pick your brains.  Just bought a Merc 560SEC, 
lovely car, pretty good condition but definitely a fixer-upper!

Appart from the MOT test and service that I'm about to put her through, the 
main problem is water: in that there seems to be a lot of it getting into 
the car.  I originally thought it was that the previous owner had left 
windows open (the damp was the reason the car was cheap), but when I drove 
it in the wet, it got much worse.  I thought it must be coming in through 
the floor, and there must be a hole in the floorpan, but when I jacked it up 
the whole undertray is completely intact (and in immaculate condition).

I am left thinking maybe it is the grill at the bottom of the windscreen and 
it's coming in through the back of the dash?

Anyway, any ideas on what it is/what is needed to fix it/scale of the 
problem/cost to fix would be GREATLY appreciatied.  I spent last weekend 
seriously scrubbing carpets, cleaning the interior of the car thoroughly 
and, with the exception of the headlining (the re-lining of which is this 
weekends task) the inside looks like new, I just need to fix the leak!

Oh, and the slide roof won't slide, just tilts, and the control doesn't seem 
to want to make the roof slide.  Normal?

Info greatly appreciated!

Brad (London)

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