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post #11 of 16 (permalink) Old 06-16-2019, 06:06 PM Thread Starter
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Originally Posted by tusabes View Post
Drill two small holes in the lower most left and right rear corners of your trunk where the battery and. C D changer sit so that water cannot build up

This is exactly what I did so water cannot build up. The trunks are sealed completely tight. I’m also thinking of drilling more under the back seat.
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post #12 of 16 (permalink) Old 06-16-2019, 07:01 PM
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"...I’m also thinking of drilling more under the back seat."

Should not be necessary, if you just keep the drain in the HVAC plenum clear, and/or drill a hole in the side of the plenum as suggested by Mercedes Benz. The rear seat drains will also not prevent water damage - the main power leads and some primary (high amperage) fuses are in the channels in the floor where the water from the plenum overflows.
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post #13 of 16 (permalink) Old 06-17-2019, 12:15 AM
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Hi,

The Trunk is not sealed completely tight, there are 2 rubber bungs with small (4mm ?) drain holes in them, but no one ever cleans them out and they become blocked, that's why I say pull em out of the hole they sit in, then you have a larger (12mm ?) drain hole that doesn't need as much clearing out !!

Or, just spend a half hour to hour once a month / 3 months (depending how often and near to trees your Car is left), and go round and clean 'em all out

As @wallyp says, MB actually recommend drilling the Heater Plenum, (probably since the USA Class action against them for FUBAR Electronics due to this issue)

HTH,


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post #14 of 16 (permalink) Old 06-17-2019, 08:43 AM Thread Starter
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Originally Posted by wallyp View Post
"...I’m also thinking of drilling more under the back seat."

Should not be necessary, if you just keep the drain in the HVAC plenum clear, and/or drill a hole in the side of the plenum as suggested by Mercedes Benz. The rear seat drains will also not prevent water damage - the main power leads and some primary (high amperage) fuses are in the channels in the floor where the water from the plenum overflows.

WallyP I swear I was thinking to drill out under neath the passenger seat. I just don’t want water collecting anywhere in the car.
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post #15 of 16 (permalink) Old 06-17-2019, 08:43 AM Thread Starter
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Hi,

The Trunk is not sealed completely tight, there are 2 rubber bungs with small (4mm ?) drain holes in them, but no one ever cleans them out and they become blocked, that's why I say pull em out of the hole they sit in, then you have a larger (12mm ?) drain hole that doesn't need as much clearing out !!

Or, just spend a half hour to hour once a month / 3 months (depending how often and near to trees your Car is left), and go round and clean 'em all out

As @wallyp says, MB actually recommend drilling the Heater Plenum, (probably since the USA Class action against them for FUBAR Electronics due to this issue) [IMG class=inlineimg]/forums/images/BenzWorld2/smilies/tango_face_sad.png[/IMG]

HTH,
Heater plenum? Under the seat?
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post #16 of 16 (permalink) Old 06-17-2019, 09:43 AM
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No not under the seat, the plastic reservoir under the windshield that fills with water. During the recall the Mercedes suggestion was to drill a hole in the side of that plastic reservoir so that water could not accumulate and would dump out in the engine bay
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