Earlier this year I found a large puddle of water on the floor on the drivers side of Inga, my 1990 740GLE.
Eventually I found the source of the problem, it was a leak where the sealed up manual air vent comes through the side panel next to firewall in the drivers side foot well. The O-ring around the plastic fitting sealing the vent was worn and I couldn't get another one. I sealed up the plastic fitting into the sidewall using silicone.
Today I found a similar puddle on the passenger's side - arggg not again!
So I removed all the carpet and underlay after removing the passenger seat. With the help of my good wife using a garden hose in the problem area, I tested to see if the same problem had arisen. No leaks. Further investigation revealed that water was coming trough the door. WTF.
So while the carpet and underlay is drying out I proceeded to remove the door trim. Fortunately I had a Haynes manual to follow. It turned out that the small water deflector had fallen down into the door. It's the one that goes behind the door speaker. So instead of water being deflected to the outside skin and vented that way it was dripping down the door trim and into the car.
OK. Now that I have it all apart letting it dry out is there any servicing i should do on the window mechanism before I put it all back together? By the way it an electric window.
I should also mention that I will be installing additional soundproofing before putting the carpet back in. I have both additional underlay and some Dynamat left over from when I did the drivers side months ago.
Well it poured down with rain this afternoon as a storm front went over. Shortly afterwards I got into Inga to go and pick up my dinner (fish & chips tonight) and put my foot into several inches of water in the driver's footwell.
I've just spent some time draining the water out - the carpet removal (again!) will have to wait until daylight tomorrow.
I found there to be water in the boot too, so maybe the door wasn't the source after all. I now suspect that the drainage system in the back is clogged, backing up the water and because of the slope of the driveway it's getting into the car and running to the front of the cabin. I've disconnected both hoses in the boot and I can feel dirt clogging the pipes that lead to the hoses.
Looks like a full day for me tomorrow, sigh.
that sucks.. but at least you get fish and chips. I want fish and chips.
I think that this time I'm going to leave the carpet and underlay out until I'm sure that there are no more bloody leaks!
I need a port!
Edit: Second line of thunderstorms going over now but I have brought Inga into the garage so she's safe for the moment.
Does it have a sunroof?
Yes it does but it's not the source of the water as the heavy rains since have proved (thankfully).
Inga is all back together now and running well again but I definitely don't want to do all that work again.
By the way do you still have the carpet from the front of your 760?
Water can get in from the firewall too.
Top tip - remove the carpets etc and put a hose on top of the car so water pours down in all directions. If you've got a leak you'll locate it pretty quickly.
Yes, I did that too, and left Inga out in three rainstorms so I'm pretty sure there's no more leaks.
New exhaust system today - apparently she still has the original Catalytic converter on!