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Dont know exact location on your model....but Mercedes hides the drain above the sound/heatshield cladding on a lot of models, so you might not be able to see it.........however...with the a/c operating you must get condensate dripping after 10 minutes of operation or there's a problem...only reason not to is if transmission is hot and vapourizing the condensate before it gets to drip on to the floor.
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