I have a 1983 240D 123 type and I had a leak into the trunk. Replacing the
rubber seal around the rear window seemed to take care of that...but there's
a leak somewhere else and water (small amount) gets into the rear passenger
floor. According to a mechanic this could be a result from the drain hole
that is located in the external compartment where the gas tank door is
opened, or it could be that underneath the car the drain plugs are clogged.
In the 240D under the car on each side there are round holes for draining
water. Apparently these can just be pulled out..and checked to see if they
are clogged. He said that the sunroof does in fact allow water in but it is
supposed to drain out...it could be a crimped drain tube somewhere from the
sunroof along the sides and down the back...that is my understanding of how
the flow from the sunroof goes..this could be wrong, but I am informed that
the felt around the sunroof is not waterproof and wasn't designed to be.
There's been excessive rain here this summer..so while the car is parked I
keep it covered with a waterproof cargo cover and the car cover. It didn't
seem to exist until the 'monsoons set in'. The amount of rain here this
summer would disclose even the tiniest of leaks. Good luck and post back
when you find where the leak was. Btw, mine also leaked around the trunk
hinge...but nothing could be seen from outside. I think the rubber strip
around the inside of where the trunk (boot) closes may need to be replaced.
The rubber seal around the rear window took care of most of the problem but
there's still water getting in from somewhere...eventhough it's a small
amount and I'm still searching.
Many thanks for your complete answer!, I will check it .
I had a leakage in my trunk too. I have replaced the rubbers of my
rearlights and the problem was solved.
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