S-Class (W221) 2007-2013: S 320 CDI, S 350, S 450, S 500, S 550, S 420 CDI, S 600

Any DIY for auxiliary water pump?

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Old Dec 7, 2023 | 08:51 PM
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Any DIY for auxiliary water pump?

Hello,


looking to replace the auxiliary water pump on my 07 Mercedes w221. Anyone instructions?
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Old Dec 8, 2023 | 09:40 AM
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If you mean the pump for the turbo intercoolers, I still have my original in place from 2007 and my understanding is Mercedes upgraded the part under a newer number. I just bought one from FCP but haven't installed it yet. Here is the link:

https://www.fcpeuro.com/products/mer...ump-0392022010

$147 delivered, lifetime warranty.

Keep us posted on what you decide to do.
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Old Dec 8, 2023 | 12:38 PM
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Old Dec 8, 2023 | 12:58 PM
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I wonder if this is the same pump or a different design with higher capacity? I am also always concerned about ebay. Totally your call but new for $147 with a lifetime warranty vs. $71 for a used ebay part is a toss up......

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Old Dec 8, 2023 | 01:01 PM
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Originally Posted by clb0099
Isn't it self-evident? I looked at doing this on a W166 it looked straightforward. Take the old one out, put the new one in.

@clb0099 what is your specific question after inspecting your vehicle’s pump installation?
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Old Dec 8, 2023 | 01:36 PM
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Does this pump anything to do with the heat in the w221. My car has been experiencing lack of heat .. I have replace most of the major components to with the coolant system.
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Old Dec 8, 2023 | 02:03 PM
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Usually, no. The heat is controlled by a heater water control valve at the back of the engine near the windshield wiper motor. It is notorious for the plastic connections failing. Typical failure is first cold day when you need heat and all it does is blow cold. Ask me how I know!

The aux pump sends water through the intercoolers to keep the charge cool on the turbos.
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Old Dec 11, 2023 | 01:34 PM
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Originally Posted by vettebk
Usually, no. The heat is controlled by a heater water control valve at the back of the engine near the windshield wiper motor. It is notorious for the plastic connections failing. Typical failure is first cold day when you need heat and all it does is blow cold. Ask me how I know!

The aux pump sends water through the intercoolers to keep the charge cool on the turbos.
Which 2007 W221 other than a diesel has a turbo or turbos?
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Old Dec 11, 2023 | 03:08 PM
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The S600 has twin turbos on a 5.5 liter V12.
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Old Jan 14, 2024 | 05:41 PM
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it’s not as straight forward as you think.. the part is pretty much wedge in there. There has to be a better way.



QUOTE=chassis;8889172]Isn't it self-evident? I looked at doing this on a W166 it looked straightforward. Take the old one out, put the new one in.

@clb0099 what is your specific question after inspecting your vehicle’s pump installation?[/QUOTE]
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Old Apr 5, 2025 | 05:52 PM
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I have 2009 S550 W221 ... Please be more specific (photos would be appreciated) ... where is the auxiliary coolant water circulation pump located? I believe it is wedged in somewhere (since I do not see it) but where is it wedged in?
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Old Jun 2, 2025 | 09:56 AM
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Get the bosch 010 pump. Its a good pump and fairly cheap for $152 at homedepot
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