Buzzing sound

[john1952]

When I open my bonnet I hear a slight buzzing noise which stops after about 10 -15 seconds. Can't trace exactly whereabouts in the engine it's coming from. 

I'm not really bothered about it - I'm sure there's a perfectly good reason for it. I'm just curious. Anyone else noticed this ??   

[Ootohere]

When you turn off an engine it still makes sure it cools it's self.

There is coolant being pumped.

[john1952]

6 minutes ago, Rooted said:

When you turn off an engine it still makes sure it cools it's self.

There is coolant being pumped.

The engine has been turned off for a least and hour - thought it would have cooled down by then ?  Or does it still go through the coolant pumping process regardless of engine temparature ??

[Ootohere]

That is different then. 

So when you open the drivers door when the car has been stopped a while it primes the fuel.

 

I take it you open the door to open the bonnet.  That will be the buzzing.

[Ootohere]

@john1952Have you had a chance to listen with the car locked, then unlock and open the drivers door and hear if the priming noise is what you hear under the bonnet?