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Water in the trunk when opening fix

Baymax3

Member
Jun 19, 2018
44
25
Canada
One of the biggest design flaws in the M3 has to be how when you open the trunk on a rainy day, water from the deck lid rolls on to the rear glass and into the trunk. Well I think (hope) I've just installed a simple fix.

Found a carbon fibre spoiler for the rear window that should defect the water to the sides and not into the trunk.
IMG_7218.jpg
IMG_2331.jpg
 

El0n

Member
Sep 21, 2019
76
70
Mars
My car Sept 2019 build has some sort of lip and ditch type of thing to direct water around the trunk and onto the ground between the lights and the trunk. It’s raining heavily as I type this and when I parked in my garage to get the groceries I got literally 2 drops into the trunk itself. Perhaps Tesla has fixed this?
 
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afadeev

Member
Feb 28, 2019
692
624
NYC
My car Sept 2019 build has some sort of lip and ditch type of thing to direct water around the trunk and onto the ground between the lights and the trunk. It’s raining heavily as I type this and when I parked in my garage to get the groceries I got literally 2 drops into the trunk itself. Perhaps Tesla has fixed this?

No, they did not.

Nor is there an easy fix, since properly engineered cars have a much deeper rain gutter between the edge of the rear window and the trunk. Model 3's don't (and other Tesla's have had their own slew of water leak problems), and would require re-engineering, re-tooling, and production downtime to address this.

Since it doesn't rain much in Cali, they didn't, and likely wont any time soon.

a
 
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El0n

Member
Sep 21, 2019
76
70
Mars
Mine certainly has a “rain gutter” and I just came into a dry garage from a heavy downpour outside and witnessed a whole bunch of water fall into the rear windshield when the trunk was opened. None of that water subsequently dripped into the trunk.
 

PACEMD

Active Member
Aug 8, 2019
1,104
1,653
Billings, MT, USA
Mine certainly has a “rain gutter” and I just came into a dry garage from a heavy downpour outside and witnessed a whole bunch of water fall into the rear windshield when the trunk was opened. None of that water subsequently dripped into the trunk.

Gotne pitchures?
 

akdnj88

Member
Aug 10, 2019
6
0
USA
Mine certainly has a “rain gutter” and I just came into a dry garage from a heavy downpour outside and witnessed a whole bunch of water fall into the rear windshield when the trunk was opened. None of that water subsequently dripped into the trunk.

Can you please post a picture of what you're talking about?
 

gcmak

Member
Jul 26, 2019
208
180
San Francisco
Since it doesn't rain much in Cali, they didn't, and likely wont any time soon.

a
Agree with you on the rare rain but I live by the coast in real heavy fog and 80% of my mornings year round consist of a wet car and reliably as I open my trunk in the morning, as the water sheets off the trunk lid and onto the rear glass...it always nicely waterfalls into my trunk.
I guess things could be better if I had no protection on the car so water wouldn't run/sheet off panels and glass...haha.
 

tuanyes84

Member
Jun 15, 2017
5
5
Portland, OR
i traded in an early 2018 for a 5xx,xxx build date and can confirm the rain gutter system is much more pronounced. Hopefully this will decrease the amount of rain getting into the cabin when opening the trunk
 
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Hens

New Member
Sep 22, 2019
1
0
Krimpen aan den IJssel
My car Sept 2019 build has some sort of lip and ditch type of thing to direct water around the trunk and onto the ground between the lights and the trunk. It’s raining heavily as I type this and when I parked in my garage to get the groceries I got literally 2 drops into the trunk itself. Perhaps Tesla has fixed this?
I have got my car 4 days now, but it does not heve some kind of gutter. Strange...
 

Rothgarr

Member
Apr 15, 2019
761
590
United States
The fix has been in for at least 6 months as far as I was aware. It is a more pronounced weatherstrip around trunk opening.
The sales guy pointed out the larger weather stripping when I asked, and mine has it, but it's still not perfect. That's why I got an all season weather mat for the trunk as well.
 
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aethatsme

New Member
Sep 15, 2019
4
1
Chicago
I believed they fixed this with a thicker weather strip. But I like the idea of having that little rear window lip to deflect the water. Got a link to it?
 

billionaiire

Member
Apr 2, 2019
258
269
West of Mississippi
2019 Model 3 and have not seen any water get into the trunk upon opening the lid ever.

side note - I used to see a couple of drops of water slip through after a downpour or car wash if I opened the charge port though. Not concerning at all. And there are battery port plastic caps available for that anyway.
 

Dinosaurus

Member
Jun 17, 2019
9
8
Portland, OR
That's cool. I'll have to try it.

I have a 6/19 build with gutter and lip, but all the rain drops do no matter slowly I open is speed down the windshield, then ramp over the gutter and into the trunk.

Only thing I can think of is that my ceramic coat and waxing of the windshield makes the water flow too fast? (Is that even possible?) Otherwise, the gutter is too narrowly designed IMO.
 
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