Late model ABC pump behaviour

brandwooddixon

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Can anyone tell me whether the ABC pump fitted to a late model W216 runs continuously or just when required, like other ancillaries fitted to M278 engine?
 

LostKiwi

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ABC pumps are mechanical and driven from the serpentine belt continuously.
 
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brandwooddixon

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That's what I thought, but I was trying to explain a grinding noise that only occurs on tight corners, intermittently when cruising in a straight line or when driving over undulations.

It also only occurs once the car has been driven a good distance at speed, at which point the small radiator in front of the main coolant radiator is sufficiently hot to produce "steam" when wet.

I know that some of the ancillaries driven by the serpentine belt have clutches to turn them off when not needed as a fuel saving measure and was wondering if the ABC pump did as well.
 

Craiglxviii

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Nope, ABC requires continuous pressurisation as it’s quite an energetic system.
 
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brandwooddixon

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Much as I thought, just wanted to clear it up , thank you.
I'll just have to carry on fighting the dealer I bought it from - looks like the next stop is court action.
 

LostKiwi

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If you bounce the front of the car when stationary with the engine running do you get the same noise?
The ABC pump will operate more with bumps and undulations than it does otherwise.
Also if you cycle through suspension heights do you get the same noise?
This may be as simple as a damper sphere getting a little tired.
 
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brandwooddixon

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I'll give it a go.
I've yet to find a switch for ride height control on this 2012 W216.
I've only found the sport/comfort switch.
 

alexanderfoti

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I'll give it a go.
I've yet to find a switch for ride height control on this 2012 W216.
I've only found the sport/comfort switch.

It's in the centre console, next to the comand screen display.
 
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brandwooddixon

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Well I live and learn.
A case of RTFM.
I saw the label for passenger airbag above the button and had assumed that was to disable it.

Thank you.

I shall take the car for a spin later to get the system really warmed up as that's when the noise presents itself.

Other than that the ride height raises to one setting, with no message in the instrument cluster, unlike the W215 which had 2 levels and did.

All four corners are pretty much even, slight tardiness front to rear but otherwise ok.
 

alexanderfoti

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Well I live and learn.
A case of RTFM.
I saw the label for passenger airbag above the button and had assumed that was to disable it.

Thank you.

I shall take the car for a spin later to get the system really warmed up as that's when the noise presents itself.

Other than that the ride height raises to one setting, with no message in the instrument cluster, unlike the W215 which had 2 levels and did.

All four corners are pretty much even, slight tardiness front to rear but otherwise ok.

Yes that was my thought as well, although I never used the intermediary setting. Also no dash display!

Remember the car will try to level the body when parked or running on anything other than completely level ground.
 

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