Strange noise from engine bay or...gearbox

[ThomasG]

Ok, this noise is hard to describe, but I'll have a go. 

Car starts and drives no problem. No issue with gear changing. However, when I stop at a junction, or pull into my drive (I am moving slowly) there's a sort of hollow noise, almost a slapping, but more of a whawhawha noise. If I put the car in neutral or park it stops. 

Put it back into drive and it's there again. 

But only after I've been driving. 

Is it transmission fluid, something loose, a worn belt?

Any ideas? I'm going to have to take it in, as I don't want it getting worse. 

Ta. 

[ThomasG]

Sorry...it sounds like it's coming from under the car towards the engine bay. 

[Stevey Y]

54 minutes ago, ThomasG said:

Sorry...it sounds like it's coming from under the car towards the engine bay. 

Sounds like a belt tensioner or alternator clutch.

Steve.

[ThomasG]

Cheers. I did think it was a belt. I'll get the garage to look at it and let you know. 

[ThomasG]

I'll try to record it tomorrow 

[ThomasG]

This is the noise! I'll get this sorted, the car is driving like a dream at the moment, so I'll get this done...asap