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Old 29-06-2016, 07:36 PM   #1
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Boot leak ml420 cdi

Hello all just notice I have a slight water leak lower boot on my w164 is this a common issue on this vehicle ? Anyone who can help in regards to a remedy would be much appreciated

Best regards dirk
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Old 06-01-2017, 07:23 PM   #2
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Hi Dirk. I'm looking for the same answers as you. There are some threads on the forum but no definitive answers on how to address the issue, which is a known problem on the ML series which affects the rear Signal Acquisition Module.

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Old 11-01-2017, 05:58 PM   #3
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I've posted the fix that worked for me here - hope it helps ML 320 W164 - Water in the Boot - Fixed?
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Old 11-01-2017, 07:38 PM   #4
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Rear light unit's leak water due to poor seals.
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Old 12-01-2017, 09:18 AM   #5
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Definately worth properly sealing both rear light clusters.

They say to find the most efficient way of doing a job, ask a lazy person, so with this in mind, I asked myself!

I concluded that a good scrub of the edges of the light clusters with an old toothbrush, followed with some black silicon seal (smoothed over with the traditional wet finger) gave a finish that was actually better than standard. More importantly, fixed my leak.

The whole job took less than 5 minutes for both sides, with no disassembly required..
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Old 12-01-2017, 09:27 PM   #6
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If you have an auto opening tailgate be careful the drive unit sat in the underside of the trunk hasn't got caked in water.
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boot, cdi, leak, ml420

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