S-Class (W220) 1999-2006: S 320 CDI, S 320, S430, S 500, S 600

What is this Thingemebob?

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Old Jul 29, 2015 | 08:48 PM
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flashprash65's Avatar
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2000 S500
What is this Thingemebob?

There a buzzing sound coming from this thingemebob that's under a plastic shroud by the firewall (see pics). The screw driver in the 1st pic points to where the part sits.


When I turn on the ac and let it run for a minute or two the part then starts to buzz. rattle and whine intermittently. when I turn off the ac it stops. It look like an electric motor (maybe) that's about 2" in diameter. It sounds like one of those cheap electric powered toys cars that got water in the motor.


DOES ANYONE HAVE ANY IDEA WHAT THIS IS? I HAVE A 2000 s500
Attached Thumbnails What is this Thingemebob?-20150729_202922.jpg   What is this Thingemebob?-20150729_202846.jpg  

Last edited by flashprash65; Jul 29, 2015 at 08:54 PM.
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Old Jul 30, 2015 | 09:03 PM
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Jeff_S500's Avatar
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2000 S500
Duo-valve. For heat..
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Old Jul 30, 2015 | 10:05 PM
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2000 S500
Originally Posted by Jeff_S500
Duo-valve. For heat..


Thanks! I just looked it up and that's it.
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Old Aug 1, 2015 | 03:24 AM
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2004 S500 4Matic
This question and answer is a great example of why this forum works so well!
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