GLS Class (X166) Produced from 2016 to 2019

Where is my water drain?

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Old 12-30-2022, 03:52 PM
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'17 GLS450, '14 GLK250, Grandpa's Roadster
Where is my water drain?

The service booklet says "Clean Water Drain". WIS has some pictures, but I can't figure out exactly where I should be looking. Does anyone have a photo of the water drain in a 2017 GLS with enough context that I could find the darn thing? What is the "cover" I need to remove? Is that the flat plastic piece between the false firewall and the channel in the cowl where the wipers are? I started to remove it, but nothing underneath looked familiar.

TIA
Old 12-30-2022, 04:49 PM
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2017 GLE350 4MATIC
Originally Posted by John CC
The service booklet says "Clean Water Drain". WIS has some pictures, but I can't figure out exactly where I should be looking. Does anyone have a photo of the water drain in a 2017 GLS with enough context that I could find the darn thing? What is the "cover" I need to remove? Is that the flat plastic piece between the false firewall and the channel in the cowl where the wipers are? I started to remove it, but nothing underneath looked familiar.

TIA
Cowl drain on left/driver’s side. Pull off rubber engine bay gasket, lift up plastic panel with drain outlet and pour water down drain to confirm it comes out and is not blocked

Sunroof (moonroof, not panorama) drain: forward corners of sunroof channel. Open roof stand on front seats through open roof and locate two small drain holes in corners of roof surround cavity. Pour water into these holes and confirm it drains out behind the front tires. Panorama roof likely similar.
Old 12-30-2022, 07:58 PM
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Is this what you're referring to?


Old 12-30-2022, 10:06 PM
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The top of your hood has gills, cosmetic vents. The left/driver's side gill has a drain under it when you open the hood. That is what I am talking about.

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