Fluid leak from the back of my car

andrewsmith335i · 08-07-2020, 01:12 PM

I have a 2008 335i coupe and there is this brownish-yellow fluid dripping on the garage floor. I don't know what it is because I'm no mechanic but it messes up the garage floor. It's near the rear wheels right about under the back seat. The leak is a little over on the drivers side of the car. Thanks.

Bimmer_Bro · 08-07-2020, 01:37 PM

Can you crawl under and see where the leak is coming from? My Guess would be the rear diff. If so, you do not want that to drain itself dry... or you will be buying a new diff.

andrewsmith335i · 08-07-2020, 01:40 PM

Quote:

Originally Posted by Bimmer_Bro

Can you crawl under and see where the leak is coming from? My Guess would be the rear diff. If so, you do not want that to drain itself dry... or you will be buying a new diff.

I did, there was this little rubber thing hanging off that I ripped off. It leaks less but it still leaks a few drops. It's off to the driver side of the car so I don't think it'd be the diff.

neilvan · 08-07-2020, 01:54 PM

The only 2 other fluids back there would be brake fluid or fuel.

Either way those 2 or diff fluid, just get a bit on your finger and smell; all 3 have a very distinct scent

Tyc0 · 08-10-2020, 04:43 PM

Could be AC condensation, but that doesn't explain why it'd mess up the floor unless it drips onto other grime somewhere else and then onto the floor.

90c4 · 08-12-2020, 11:27 AM

Could also be dirty runoff water from a sunroof drain. I know there's a drain to the outside on the left side where the amplifier is. Not sure if the battery area has one too

08-07-2020, 01:12 PM	#1
andrewsmith335i Private 27 Rep 66 Posts Drives: 2015 BMW X3, 2009 BMW M3 Join Date: Jun 2020 Location: tampa, fl iTrader: (0)	Fluid leak from the back of my car I have a 2008 335i coupe and there is this brownish-yellow fluid dripping on the garage floor. I don't know what it is because I'm no mechanic but it messes up the garage floor. It's near the rear wheels right about under the back seat. The leak is a little over on the drivers side of the car. Thanks.
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08-07-2020, 01:37 PM	#2
Bimmer_Bro Captain 394 Rep 972 Posts Drives: 2010 BMW 335xi LCI Join Date: Dec 2019 Location: Calgary Alberta Canada iTrader: (0)	Can you crawl under and see where the leak is coming from? My Guess would be the rear diff. If so, you do not want that to drain itself dry... or you will be buying a new diff. __________________ Instagram : @Bimmer_bro
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08-07-2020, 01:54 PM	#4
neilvan Major 861 Rep 1,371 Posts Drives: 09 E90 335i M-Sport 6MT RWD Join Date: Nov 2017 Location: Ontario, Canada iTrader: (0) Garage List 2007 BMW E61 530xi [0.00] 1993 Mazda Miata [0.00] 2009 BMW E90 335i [0.00]	The only 2 other fluids back there would be brake fluid or fuel. Either way those 2 or diff fluid, just get a bit on your finger and smell; all 3 have a very distinct scent
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08-10-2020, 04:43 PM	#5
Tyc0 Lieutenant 151 Rep 517 Posts Drives: BMW e92 335i Join Date: Sep 2019 Location: Oregon iTrader: (0)	Could be AC condensation, but that doesn't explain why it'd mess up the floor unless it drips onto other grime somewhere else and then onto the floor.
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08-12-2020, 11:27 AM	#6
90c4 First Lieutenant 65 Rep 301 Posts Drives: 2009 335i xdrive coupe Join Date: Dec 2014 Location: Boston iTrader: (0)	Could also be dirty runoff water from a sunroof drain. I know there's a drain to the outside on the left side where the amplifier is. Not sure if the battery area has one too
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