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  #1  
Old 08-17-2013, 06:15 PM
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Water Leak Question

The pic shows where watering is entering the front left of the driver's footwell on my 95 300D when I spray water on the windshield. The windshield seals look like they've seen better days. The drain in that area does not appear to be clogged.

My question: is it likely that watering entering at the point is the result of a windshield that is not properly sealed, based on the information I've provided?

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06 E320 CDI "Benson", Platinum Blue, 180k mi, Stage 1 tune
06 E320 CDI "Rutherford", Black, 151k mi, Stage 1 tune
91 300D "Otis", Smoke Silver, 132k mi

19 Honda CR-V EX 10k mi
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  #2  
Old 08-17-2013, 06:37 PM
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There are 3 drains to check. Sunroof drain, check with string trimmer line, if you insert on top it will come out between the front door and the front fender, you can see it with the door open. Windshield drain, if you pour water at the corner of the windshield it should drain underneath, if not you can tediously remove the "funnel" plastic piece and roto-root the drain pipe out with something like a nut and bolt grabber/plunger thingy with fingers that poke out when you push a plunger.

And last, I don't know from where this drains, but you can see a drain pipe from underneath, behind the front wheel well. This pipe sticks out from the floor pan and will have a rubber thing in it to keep flow from the road going up, but you can poke something flexible up through that sort of one way valve and you may find it plugged with crap. Wish I had a pic, but mine was really plugged up and when I unplugged it a lot of old water drained out...

If not those, can't help much other than the rear wheel well plug which has been discussed.

Rgds,
Chris W.
'95 E300D, 401K
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Old 08-17-2013, 06:46 PM
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Definitely not coming from wheel wells. Can't be sunroof drains either, cuz water comes in when I spray water only on windshield. I'll focus on the other two.
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06 E320 CDI "Benson", Platinum Blue, 180k mi, Stage 1 tune
06 E320 CDI "Rutherford", Black, 151k mi, Stage 1 tune
91 300D "Otis", Smoke Silver, 132k mi

19 Honda CR-V EX 10k mi
Thirteen other MB's owned and sold
1961 Very Tolerant Wife
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Old 08-17-2013, 06:52 PM
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When you wet the windshield, does water get to the area behind and aft of the brake booster and fuse box?

Read through this - PeachPartsWiki: Blower Motor Removal - then remove the black plastic trim ahead of the driver. You might have to set the wiper to vertical but IIRC no need to remove the wiper. You,ll see the base of the windshield and you might get a better view of the leak source.

Sixto
87 300D
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Old 08-17-2013, 07:11 PM
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Quote:
Originally Posted by sixto View Post
When you wet the windshield, does water get to the area behind and aft of the brake booster and fuse box?

Read through this - PeachPartsWiki: Blower Motor Removal - then remove the black plastic trim ahead of the driver. You might have to set the wiper to vertical but IIRC no need to remove the wiper. You,ll see the base of the windshield and you might get a better view of the leak source.

Sixto
87 300D
Yes, I think so (not with the car right now). Is that black plastic trim designed to deflect water? If so, it didn't seem to be grabbing the window very well. To isolate it, I put electrical tape along the edge, but that didn't help.

The drains appear to be clear.
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06 E320 CDI "Benson", Platinum Blue, 180k mi, Stage 1 tune
06 E320 CDI "Rutherford", Black, 151k mi, Stage 1 tune
91 300D "Otis", Smoke Silver, 132k mi

19 Honda CR-V EX 10k mi
Thirteen other MB's owned and sold
1961 Very Tolerant Wife
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  #6  
Old 08-17-2013, 07:23 PM
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A related question (and, Sixto, I know how you love to help me with my car sales)....since I'm selling the car, if it is likely that the window is the culprit, do I simply disclose the issue and sell as is, or do I pony up $175 and replace the windshield in my effort to sell it? I will add that the windshield is a bit pitted.
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06 E320 CDI "Benson", Platinum Blue, 180k mi, Stage 1 tune
06 E320 CDI "Rutherford", Black, 151k mi, Stage 1 tune
91 300D "Otis", Smoke Silver, 132k mi

19 Honda CR-V EX 10k mi
Thirteen other MB's owned and sold
1961 Very Tolerant Wife
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  #7  
Old 08-17-2013, 08:42 PM
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The black trim isn't a hermetic seal against the windshield but very little water if any won't roll over the trim into the collection trough in the cowl. That trim piece in my car has come loose a couple of times while driving yet no water gets to the firewall, not even when it rains a lot in the local sense. So the area around the master cylinder and fuse box should remain dry. If you see water there, that's my guess as to how it's getting into the cabin.

My point in having you remove the trim is to confirm that the windshield sits on a bead of sealant, rather than in a fitted weatherstrip as does the windshield of a VW bug (the real one). I don't see the seal getting wet let alone letting water through. It's a PITA but it's worth removing the trough to find the entry point. Well, it's worth it for a keeper. Since you're selling the car, consider...

My conniving mind says that if you replace the windshield and it still leaks, you can blame a poor replacement job

How's the floor under the driver footwell mat?

Sixto
87 300D
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  #8  
Old 08-17-2013, 11:17 PM
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Shertex, I also have a 95 E300D that was getting some water in the footwell. Water was ingressing below the rubber seal at the base of the windshield, specifically in the area of the wiper, and getting into the cabin air filters. The wet filters were also causing the windows to fog whenever it rained.

In my case, the windshield had been replaced by the PO with a non-MB part which did not incorporate the flange at the bottom of the windshield to which the rubber seal attaches. The installers had used windshield sealant to stick the rubber seal to the windshield but did a very poor job of it, leaving gaps in the sealant for water to flow through.

My solution was to purchase 3M Window Weld urethane sealant (Autozone, $25 or so) and run a continuous bead below the upper edge of the rubber seal to adhere it to the windshield. Worked great, no more leaks. It's reversible as well, I've had to pull it loose once to access the blower motor and the urethane separates cleanly from the seal with a little care.

Hope yours is this simple!

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