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What is this and why is it clicking?

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Old 12-24-2013, 12:25 PM
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2015 GL550 4matic
What is this and why is it clicking?
Can anyone tell me what this part is. It seems to be a small solenoid valve of some kind, and it is clicking rapidly. Location is directly in front of the washer tank, or just behind the LH headlight.

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Old 12-26-2013, 11:20 AM
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2002 CLK55
Bump on this one cause I've got the same sound.
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Old 12-26-2013, 04:14 PM
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CLK55 and CLS55
Its a purge valve
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Old 12-26-2013, 04:42 PM
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2015 GL550 4matic
Originally Posted by FinnAussie
Its a purge valve
for what system? Should it be clicking rapidly?
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Old 12-26-2013, 05:19 PM
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2001 CLK55 AMG
Mine always has, quite loud at idle. From the research I've done, it's normal. Quite loud, I can hear mine from in the cabin.


Originally Posted by jonUF02
for what system? Should it be clicking rapidly?
Last edited by Scott Simoncic; 12-26-2013 at 05:22 PM.
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Old 12-26-2013, 06:09 PM
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Its function is to create a vacuum in the gas tank and fuel line system so that fume is sucked into the engine to burn instead of venting to the outside atmosphere and ticking sound is normal
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Old 12-27-2013, 08:15 AM
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It's normal. Mine has always clicked as well.
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Old 12-27-2013, 10:28 AM
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2006 E55, 2012 GLK350 & 1992 190e sportline
you can clean it. If you do it will not be as loud untill it gets dirty again.
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Old 12-27-2013, 08:56 PM
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Would you happen to have a DIY on the cleaning? Or any tips?

Originally Posted by insame1
you can clean it. If you do it will not be as loud untill it gets dirty again.
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