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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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  #1  
Old 03-02-2014, 11:56 AM
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matt540 matt540 is online now
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Moisture in tail lights

Has anybody had an experience with moisture build up in the tail lights? I pulled them off and sealed in between the tail light and body where they mount with black silicone. Im still getting moisture in the housing itself and they are about two years old. I cant see how it could be collecting moisture unless there is a crack in the housing itself.


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Old 03-02-2014, 12:00 PM
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tmvE39/E53/Z32 tmvE39/E53/Z32 is offline
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You need to replace the gasket between the taillight and the body.
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Old 03-02-2014, 12:07 PM
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matt540 matt540 is online now
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Quote:
Originally Posted by tmvE39/E53/Z32 View Post
You need to replace the gasket between the taillight and the body.

I put quite a bit of silicone sealer there just about three days ago.


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Old 03-02-2014, 01:25 PM
Trent540i Trent540i is offline
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matt540,

Are your tail lights OE/Hella's? I had a bad experience with some aftermarket tail lights. They didn't seal properly and leaked in the rain as you've described. I ended up buying some Hella's to solve the problem.

Cheers,

Trent


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Old 03-03-2014, 06:04 PM
mrpumpk1n mrpumpk1n is offline
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Hey Matt, few things. Firstly, make sure the moisture is FULLY evaporated and dried inside the housing before you seal it or you will never get rid of the moisture and the moisture will keep reappearing on heat/cool cycles. Next, when sealing with the RTV, smear the area with the RTV (with rubber gloves on), to make sure it is fully sealed. Just running a bead of the RTV does not insure a leak proof seal. Lastly, use an RTV that cures by absorbing moisture and make sure you avoid using an RTV that outgasses moisture while it cures.
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Old 03-03-2014, 06:46 PM
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matt540 matt540 is online now
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Quote:
Originally Posted by Trent540i View Post
matt540,

Are your tail lights OE/Hella's? I had a bad experience with some aftermarket tail lights. They didn't seal properly and leaked in the rain as you've described. I ended up buying some Hella's to solve the problem.

Cheers,

Trent


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I do have the the OE Hellas, this is the first time I have had problems with them in the year I have had them.
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Old 03-03-2014, 06:52 PM
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Quote:
Originally Posted by mrpumpk1n View Post
Hey Matt, few things. Firstly, make sure the moisture is FULLY evaporated and dried inside the housing before you seal it or you will never get rid of the moisture and the moisture will keep reappearing on heat/cool cycles. Next, when sealing with the RTV, smear the area with the RTV (with rubber gloves on), to make sure it is fully sealed. Just running a bead of the RTV does not insure a leak proof seal. Lastly, use an RTV that cures by absorbing moisture and make sure you avoid using an RTV that outgasses moisture while it cures.
Thanks ill take the tail light off tomorrow or this weekend, I used Ultra Black silicone, what kind do you recommend?
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