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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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Old 05-16-2019, 09:22 AM
DFI-9 DFI-9 is offline
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Location: Atlanta
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Mein Auto: 2003 530i
List of common water leaks?

My first real project for my E39 is to make it waterproof, but I can't find a list of common water leaks...
I've read about doors and sunroof, but I assume there are others.
Current issues:
Water on the back floor Doors
Water getting into my LCM - ?
Having to start in neutral if in heavy rain - ?
Any advice for these issues would be appreciated, but I would love a list of everything I should look into when it comes to waterproofing. Thank you much!
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Old 05-16-2019, 11:12 AM
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540 M-Sport 540 M-Sport is offline
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Mein Auto: M550i, 540M-Sport, Scud
Another source is water can leak through the tail light gaskets. Usually simply removing the tail lights, clean the back of the lights and the mating surface of the car, and carefully reinstall and snug up the mounting nuts, and all is good. In rare cases, you might have to replace the gaskets. One has to be careful not to overtighten the nuts, being set in plastic, you can break the studs out of the light.
540 M-Sport package (Canadian market), factory Bluetooth phone integration, factory M-Audio 10" dual voice coil subs, Homelink, Eibach front and rear anti-roll bars, M5 rear traction rods, H&R 15mm wheel spacers, ST X (KW) coilovers, Strong Strut front upper stress bar, BMP strut tower reinforcement kit, Stop Tech ss brake lines, Akebono Euro Ceramic brake pads, Zimmerman rotors, Dinan Stage 1 software, USA Spec Ipod/Iphone integration.
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Old 05-16-2019, 01:17 PM
540fan 540fan is offline
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Check sunroof drains and clear them of debris.

Had them plug up on a 745iL and water everywhere inside.
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Old 06-16-2019, 08:23 PM
canam8 canam8 is offline
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Mein Auto: 2002 bmw 525i
Neutral problem may be your boot on the wiring harness. Mines dry rotted and I was also having issue until I went into a car wash and got the under carriage cleaning and it put my car into limp mode. That's when I found out after looking underneath that my boot looked good at a quick glance but soon as I touched it it crumbled to pieces. I dried the harness and inspected all the wires. Put it back together and used a good silicon and put a thick coat all around it and let the car sit for a couple days. I haven't had any trouble since and that was 8 yrs ago. Still driving the car. It has 475,000 on it

Last edited by canam8; 06-16-2019 at 08:25 PM.
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Old 06-17-2019, 02:10 AM
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Burning2nd Burning2nd is offline
Under the lift arms
Location: Under the lift Arm
Join Date: Aug 2010
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Mein Auto: e39, e83, e60
wow! half a million.. Im jealous
Specializing In Breaking Things Professionally

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Old 06-17-2019, 01:33 PM
MRX9989 MRX9989 is offline
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Mein Auto: 01 530i
I had moisture get into my glove box/general module/light control module area through the trunk DME relay box. The box was not completely sealed. The trunk will get moisture if the trunk lid harness gasket is failing.
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