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Hello,
I have a continual buzzing noise coming from the engine after stopping my DS4. The car is a sport version and is with a THP 200 1.6L turbo charged petrol engine.
The buzzing noise is coming from the additional electric water pump which is located below the turbo charger. It appears to pump coolant through the turbo body to cool it.

I'd appreciate it if someone could clarify the following questions for me:-
A) what is the actual purpose of this pump?
B) is it normal for this pump to produce a loud, high pitched buzzing sound?
C) is it normal for this pump to continue to make this sound (pump) for approximately 10 minutes after stopping the car?

Any assistance would be greatly appreciated.


 
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