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Old 11-11-2012, 07:17 PM   #1
BMe30
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Water under batt tray in trunk...

I drained the water from that plug under the car... When i removed the battery to dry the remaining water i noticed that there was a tube connected to the drain plug.. But where does this connect to?



Any ideas?
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Old 11-11-2012, 07:18 PM   #2
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It's supposed to be for that overflow port on the side of the battery.
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Old 11-11-2012, 08:53 PM   #3
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Any idea where that water is coming from that stands under the batt tray?
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Old 11-11-2012, 08:59 PM   #4
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Sunroof drain?? That looks like the battery vent hose
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Old 11-11-2012, 09:39 PM   #5
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How can i check if it is the sunroof drain?
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Old 11-11-2012, 11:23 PM   #6
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open your sunroof and pour some water down the back drain and see if it leaks into the battery tray. Could also be a leaky taillight gasket, or there is a grommet above the battery tray where your sidemarker light wire exits the car.
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Old 11-12-2012, 12:32 AM   #7
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^^^ thanks.. Ill give it a try
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Old 11-12-2012, 04:36 PM   #8
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Might be the flap vent from the trunk to inside the rear bumper, thats where the sunroof drain should be if it's connected properly. It could also be your trunk seal, mine leaks a bit into the battery area when I wash the car or park nose down in the driveway.
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Old 11-15-2012, 08:49 PM   #9
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Sun roof drains is a black hose that goes into that vent behind the bumper
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Old 11-15-2012, 09:08 PM   #10
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Thanks for all the info!

Im going to do some water tests this weekend after i fix my oil leak by the oil filter canister and the block. Very common on the m42 it seems
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Old 11-15-2012, 09:25 PM   #11
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Connect the battery vent too! Acid from an unvented battery will rust your shit faster than a puddle of water ever would...
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Old 04-04-2013, 10:32 AM   #12
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So it turned out to be the gasket around the passenger side rear tail light. It wasn't seated properly.
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Old 04-10-2013, 09:09 PM   #13
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Nice u silcone it?
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Old 04-10-2013, 09:58 PM   #14
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Quote:
Originally Posted by BmW1819 View Post
Nice u silcone it?
No.. The rubber seal around the tail light was not seated properly. I reinstalled the rubber properly and took care when reinstalling the tail light to the car. Did a leak test with my hose and it was dry. The past few days i left my car out in he rain... So far atill dry
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Old 04-11-2013, 09:10 PM   #15
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Ahhh nice
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