DennisG01

I noticed the front passenger floor getting damp. I checked the windshield cowl drain (the actual "tube" that drops down below the car) and it was clogged (thanks to a "messy" neighbor's tree). I pulled the seat out and pulled the carpet up and sure enough there was a bit of water down there. Not horrible - maybe an inch or so. Not really enough to cause a concern with any of the electronics since they were higher up (although sloshing could be a slight concern). But, I cleared the clog, dried everything up under the floor and let it sit for two days to further dry and sprayed down things with WD40 (this is one of the few times when WD40 IS good!). I even pulled apart a bunch of lower electrical connectors and physically cleaned/protected them. Put it all back together.

That was 5 days ago. Had a good rain last night... there was a little water on the floor mat. I just now checked to see if the cowl drain was clogged... it was not. So... did the drain tube clog up temporarily and then unclog as the rain softened the "clog"? OR... is there another drain area that can clog and cause water to show up on the front passenger floor?

I can run water from a hose down the windshield at a later time... when I have that thing that I hear is referred to as "free time"

Max Blast

When this happens the cabin air filter box is the culprit. Since you’ve cleared the clog, what is left is residual moisture in the filters - they may be waterlogged.

you should check and replace them if so.
also go through the battery compartment again.

DennisG01

Thanks, Max. I did check the air filter last time and it was dry. The clog was definitely in the cowl drain - which is different than the filter box drain. But I'll check that again just to be sure. I'll check under the floor for water again - that's easy enough to do by parking on an incline and just removing the battery cover.

If it's not the cowl drain or filter box drain, I'm kinda stumped, though.

not2fast

Any links to a good article on which drains need looking at from time to time for maintenance reasons? (Mine never sits outside, but I would love to stay ahead of any potential problems)

DennisG01

The two that have been mentioned, of course. Also the sunroof drains. Something like weed whacker line is usually pretty good at clearing clogs. You can just pour water into them to do a quick check, though, to make sure the water dumps out below the car... and not into the car!

Scott Hart

You can go find my magical journey to Narnia and the “fun” you’ll have. Doesn’t mean JUST that spot is leaking. I’ve stopped mine like I took it to a strip club and made it rain… It could be your roof rails as well. I’m currently trying to remove mine. Anything I can get out I’m pulling and driving it back in with black silicon adhesive. Once you get done you HAVE to purchase a ionizer to kill all of the bacteria, mold and mildew. It’s just sitting there and will make you sick. It’s pretty cool! I used it and there was NO smell. It’s insane. READ the directions and use caution!!!!! Once I get finished I will post the 3rd leg of the journey.


https://mbworld.org/forums/gl-class-...e-gl-leak.html

BlownV8

Have the same ozone machine. There is definitely a smell but it is an ozone smell. It does work wonders on odors but, keep in mind, ozone is something you want to avoid breathing.

eric_in_sd

Do you know how the water gets inside the passenger compartment when the drains are stopped up?

BlownV8

This killed my car so take action if you notice a leak or blocked drain. It may go down the A pillar and onto the floor or it could drip down from the roof onto the seat and then onto the front SAM. From there, all hell can break loose. Water dripping on the SAM caused the windows to roll down and the car got flooded in a severe rainstorm.