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  #1  
Old 05-16-2019, 05:27 PM
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Join Date: Aug 2018
Location: Canada
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Common spots for water to leak into the cabin in W115?

Hey folks,

When it rains I've been having water pooling in the passenger front footwell of my 1974 W115. I've got the mat out of it so it's no longer soaking it all up, and have resorted to manually mopping it out instead.

I've recently had a couple of rust holes on the footwell/bulkhead there welded up and also sealed/protected the entire floorpan (such a satisfying job I might add!) but I'd rather just have a dry interior than constant mopping after it rains!

I can't see anywhere obvious the leak is coming from. I was hoping folks here might have some more insight?

FYI, there's no electric windows or central locking on my car for added wires to allow water to drip down!

Thanks
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  #2  
Old 05-16-2019, 05:32 PM
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Could the windshield seal be leaking with the water running down the inside of the firewall?
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  #3  
Old 05-16-2019, 10:47 PM
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Mine used to do that. I fixed it by (1) replacing the windshield seal and (2) putting silicone caulking in the vacuum line harnesses between the body and the doors. For the latter, the original rubber snaking insulation around the vacuum lines is probably cracked away, so water between the doors gaps will run right in. For me, it was a lot easier and cheaper than replacing the rubber shielding. I did one of them first and it helped but didn't entirely fix it; water in either will end up inside the car.



-Henry
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  #4  
Old 05-17-2019, 11:20 AM
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Thanks for the suggestions! I'll investigate both and go from there
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  #5  
Old 05-17-2019, 04:57 PM
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Quote:
Originally Posted by cleeves View Post
Mine used to do that. I fixed it by (1) replacing the windshield seal and (2) putting silicone caulking in the vacuum line harnesses between the body and the doors. For the latter, the original rubber snaking insulation around the vacuum lines is probably cracked away, so water between the doors gaps will run right in. For me, it was a lot easier and cheaper than replacing the rubber shielding. I did one of them first and it helped but didn't entirely fix it; water in either will end up inside the car.



-Henry
I have run into both of these. And that windshield seal is a common place for leaks. These are not that expensive and are not even that hard to do. But you might want to just get a new windshield and seal installed at the same time by a glass shop.

Check the seals around your taillights. These are also prone to leaking water into the trunk. I have tried resealing them but nothing works as well as just replacing them. Again, not hard to do.
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  #6  
Old Yesterday, 07:41 PM
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If the leak is from the windshield, you should also check the rear passenger foot wells. It's common for water to run under the carpet and accumulate back there.
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