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      11-14-2019, 09:59 PM   #1
Zee32
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Water accumulation under car after rain?

I recently bought my M4 a week ago, it rained the day before but it seems like the water has accumulated and is slowly draining (drop by drop) from the front passenger side. I touched the liquid and it had no smell or color to it. Has anyone experienced this before? Any suggestions?
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      11-14-2019, 10:09 PM   #2
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AC?
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      11-14-2019, 10:58 PM   #3
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Quote:
Originally Posted by LOW4LYF View Post
AC?
Haven't used the AC since I bought it so been like a week. And the car has been standing for 3 days.
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      11-14-2019, 11:04 PM   #4
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Need a little more info,

Is it a sunroof top?

Is it a brand new car?
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      11-14-2019, 11:05 PM   #5
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Quote:
Originally Posted by lukej View Post
Need a little more info,

Is it a sunroof top?

Is it a brand new car?
Yes it does have a sunroof, no it's a 2015 M4. Still under Manufacturer warranty till Mid next year.
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      11-14-2019, 11:12 PM   #6
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Quote:
Originally Posted by zack32 View Post
Yes it does have a sunroof, no it's a 2015 M4. Still under Manufacturer warranty till Mid next year.
There should be two holes in your sunroof gutter/track,, take some shop air and very gently blow some air in it, and have someone watch out the bottom and feel if there’s air coming out. Don’t get crazy with the air, if it’s plugged you could spray water back in your car.

It could be partially plugged. And that’s why it’s a slow drip.

If it is plugged and gets worse it going in your car next rain

Or just take it to BMW and tell them to check it.

Good luck !
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Last edited by lukej; 11-15-2019 at 06:53 PM..
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      11-14-2019, 11:34 PM   #7
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if yours is F83 then clogged. there's TSB on it.
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      11-14-2019, 11:37 PM   #8
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Quote:
Originally Posted by jzhu625 View Post
if yours is F83 then clogged. there's TSB on it.
Found a little info in the tech manual

Here is a link..

https://www.newtis.info/tisv2/a/en/f82-m4-cou_201609/
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      11-14-2019, 11:42 PM   #9
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Quote:
Originally Posted by lukej View Post
Quote:
Originally Posted by jzhu625 View Post
if yours is F83 then clogged. there's TSB on it.
Found a little info in the tech manual

Here is a link..

https://www.newtis.info/tisv2/a/en/f82-m4-cou_201609/
One more

This page scares the hell out of me! Hope it not this.
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      11-15-2019, 12:04 AM   #10
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Quote:
Originally Posted by lukej View Post
Found a little info in the tech manual

Here is a link..

https://www.newtis.info/tisv2/a/en/f82-m4-cou_201609/
Thanks, should this be covered under warranty?
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      11-15-2019, 02:36 PM   #11
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Could be water just sitting on the bottom covers. Or it could be the sunroof drains as well.
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      11-16-2019, 01:17 AM   #12
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The photo the OP posted is of the right front corner of the car. You can see the plastic splash shield that covers the auxiliary radiator and the big aluminum belly pan in the background. The plastic shield has a little hole in it to allow water drainage. Since the fluid is clear and has no smell, there are no concerns about it being a coolant leak.

Because of how the front of the car is built, water can get to that location quite easily, so it could have accumulated almost anywhere in the engine compartment and slowly migrated down to that spot by gravity. There is nothing to be concerned about here. Cooler temps and not being driven means the water hasn’t been able evaporate.

It has been raining like mad here and I have water coming out of every orifice on my M3.
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      11-16-2019, 09:00 PM   #13
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We did an mid-interval oil change on my wife's M3 today and while it was up on the QuickJacks, I took the opportunity to take a picture of the right front Lower Deflector. As I remembered, and as you can see, there is a whole in this panel, presumably a drainage hole, and it looks like it was doing it's job on the OP's car, draining water that had made its way down to the Lower Deflector and then out through the drainage hole:
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      11-26-2019, 09:29 PM   #14
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You've got a clogged drain, sunroof or otherwise.
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      11-26-2019, 11:10 PM   #15
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Quote:
Originally Posted by Zee32 View Post
Yes it does have a sunroof, no it's a 2015 M4. Still under Manufacturer warranty till Mid next year.
Is it a CPO?
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      11-26-2019, 11:15 PM   #16
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Quote:
Originally Posted by FlyingLow78 View Post
The photo the OP posted is of the right front corner of the car. You can see the plastic splash shield that covers the auxiliary radiator and the big aluminum belly pan in the background. The plastic shield has a little hole in it to allow water drainage. Since the fluid is clear and has no smell, there are no concerns about it being a coolant leak.

Because of how the front of the car is built, water can get to that location quite easily, so it could have accumulated almost anywhere in the engine compartment and slowly migrated down to that spot by gravity. There is nothing to be concerned about here. Cooler temps and not being driven means the water hasnít been able evaporate.

It has been raining like mad here and I have water coming out of every orifice on my M3.
Exactly!

Quote:
Originally Posted by BavarianFanatic View Post
You've got a clogged drain, sunroof or otherwise.
Why do you think that a clogged drain would drain out through the hole in the right front Lower Deflector?
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      11-27-2019, 12:29 AM   #17
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Quote:
Originally Posted by SD ///M4 View Post
Exactly!



Why do you think that a clogged drain would drain out through the hole in the right front Lower Deflector?
That is a weird..diagnosis.
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      11-27-2019, 01:02 AM   #18
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if sunroof was closed, and probably was, it's drain hoses and everything underneath should be dry. Hence the seal around the glass. I'm confused with so many of you suggesting it as a culprit .
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      11-27-2019, 01:51 PM   #19
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Quote:
Originally Posted by SD ///M4 View Post
Exactly!



Why do you think that a clogged drain would drain out through the hole in the right front Lower Deflector?
If it wasn't clogged, there wouldn't be a slow drip...

I missed that it was the lower deflector, so obviously not sunroof related.
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      11-27-2019, 01:53 PM   #20
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Quote:
Originally Posted by zuna13 View Post
if sunroof was closed, and probably was, it's drain hoses and everything underneath should be dry. Hence the seal around the glass. I'm confused with so many of you suggesting it as a culprit .
The seal around the sunroof is not watertight. That's why it has drains. They do clog, even if the sunroof is never opened. They can get an accumulation of bio-film or insect nests (spiders often).
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      11-27-2019, 08:07 PM   #21
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Quote:
Originally Posted by BavarianFanatic View Post
If it wasn't clogged, there wouldn't be a slow drip...

I missed that it was the lower deflector, so obviously not sunroof related.
Accumulated water that drains from literally anything will eventually slow to a drip, and then stop dripping. That doesn't happen just because something is clogged, it's just physics...
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